The Eastern Schism in 1054 had a long and troubled history, it was mostly over politics. For more details see the two brief paragraphs below:
from A Catholic Dictionary, edited by Donald Attwater, Second edition, revised 1957
The Schism of the East the estrangement and severance from the Holy See of what is now called the Orthodox Eastern Church was a gradual process extending over centuries. After a number of minor schisms the first serious, though short, break was that of Photius; from then on tension between East and West increased, and the schism of Cerularius occurred in 1054. From then on the breach gradually widened and has been definitive since 1472. There was a formal union from the 2nd Council of Lyons in 1274 until 1282, and a more promising one after the Council of Florence from 1439 to 1472. After the capture of Constantinople it was in the Turkish interest to reopen and widen the breach with the powerful Roman church; the patriarchates of Alexandria, Antioch, and Jerusalem were dragged into this policy, Russia and the Slav churches stood out the longest of any: none of these churches, except Constantinople itself in 1472, formally and definitely broke away from the unity of the Church. But in the course of centuries the schism has set and crystallized into a definite separation from the Holy See of many million people with a true priesthood and valid sacraments. The origins, causes and development of the schism are matters of much complication, still not fully unraveled.
from Modern Catholic Dictionary by John A. Hardon, S.J. Doubleday & Co., Inc. Garden City, NY 1980
Separation of the Christian Churches of the East from unity with Rome. The schism was centuries in the making and finally became fixed in 1054, when the Patriarch of Constantinople, Michael Cerularisu (died 1059), was excommunicated by the papal legates for opposing the use of leavened bread by the Latin Church and removing the Pope's name from the diptychs or list of persons to be prayed for in the Eucharistic liturgy. A temporary reunion with Rome was effected by the Second Council of Lyons (1274) and the Council of Florence (1439) but never stabilized
They formally split the Christian Church apart They created two completely separate churches.
The two Christian churches that developed after the split in 1054 are the Roman Catholic Church, based in Rome and headed by the Pope, and the Eastern Orthodox Church, which has its headquarters in Constantinople (modern-day Istanbul) and is led by various patriarchs.
Throughout its history the Christian church has undergone two major splits:The first occurred in 1054 AD, in what is commonly called "The Great Schism" in which the church was split into the Eastern Orthodox and Western branches. The split came to be as a result of deteriorating relations, and theological disagreements between the Pope of Rome, and the Patriarch of Constantinople.The second split began in 1517 AD, but was not officially recognized until 1648. This split of the Catholic church occurred when Martin Luther posted his infamous "Ninety-five Theses" and Christians across Europe defected from the Catholic church, forming the Protestant branch of Christianity.
The Christian religious branch that split from the Roman Catholic Church in the 16th century was Protestantism. This split was initiated by Martin Luther and led to the Reformation movement, which resulted in the formation of various Protestant denominations.
The historical event that led to the existence of married popes in the Catholic Church was the Great Schism of 1054, which resulted in the split between the Roman Catholic Church and the Eastern Orthodox Church. This division allowed for some married men to become popes in the Roman Catholic Church.
The excommunications of 1054 led to the Great Schism between the Roman Catholic Church and the Eastern Orthodox Church. This division created a lasting rift between the two branches of Christianity that persists to this day.
The western church became known as the Roman Catholic Church after the Great Schism of 1054. This schism divided Christianity into two branches: the Western Church, led by the Pope in Rome, and the Eastern Church, known as the Orthodox Church, headed by the Patriarchs of Constantinople.
One major result of the Reformation was the split of the Western Christian Church into Catholic and Protestant branches. This led to religious conflicts, wars, and the development of new interpretations of Christian doctrine and practice.
Martin Luther lead the Protestant movement which condemned the Catholic church. Some monarchs liked the movement and changed the religion of their kingdoms from Catholic to Protestant.
The Orthodox Church is considered to have originated first, with roots tracing back to the early Christian communities in the Eastern Roman Empire. The Catholic Church developed later, with the Great Schism in 1054 leading to the split between the Eastern Orthodox Church and the Roman Catholic Church.
The only church that existed in this time was the Catholic Church.
The Great Schism, also known as the East-West Schism, was caused by a combination of theological, political, and cultural differences between the Roman Catholic Church in the West and the Eastern Orthodox Church in the East. These differences ultimately led to a split in 1054, dividing Christianity into the Western (Catholic) and Eastern (Orthodox) branches.