What were the major changes that church reformers tried to achieve?

Answer 1

Catholic Answer The reformers did not work for change in the Church, so much as to purify her of heresy and of sinful practices by some of her members. They did this by following the Will of God and becoming great saints. Some of them, like St. Theresa of Avila, Saint John of the Cross, and St. Ignatius of Loyola founded great religious Orders. Others, like St. Francis de Sales, both ran a diocese and converted protestants back to Christianity. Still others, like King Ferdinand and Queen Isabella of Spain governed their country in a Christian manner and protected it from heretics. All of them started by being exemplarily Christians in their personal lives, and following the Will of God.

from the Catholic Encyclopedia

The term Counter-Reformation denotes the period of Catholic revival from the pontificate of Pope Pius IV in 1560 to the close of the Thirty Years' War, 1648. The name, though long in use among Protestant historians, has only recently been introduced into Catholic handbooks. The consequence is that it already has a meaning and an application, for which a word with a different nuance should perhaps have been chosen. For in the first place the name suggests that the Catholic movement came after the Protestant; whereas in truth the reform originally began in the Catholic Church, and Luther was a Catholic Reformer before he became a Protestant. By becoming a Protestant Reformer, he did indeed hinder the progress of the Catholic reformation, but he did not stop it.

from

A Catholic Dictionary,edited by Donald Attwater, Second edition, revised 1957

The Counter-Reformation is the name given to the Catholic movement of reform and activity which lasted for about one hundred years from the beginning of the Council of Trent (q.v., 1545), and was the belated answer to the threatening confusion and increasing attacks of the previous years. It was the work principally of the Popes St. Pius V and Gregory XIII and the Council itself in the sphere of authority, of SS. Philip Neri and Charles Borromeo in the reform of the clergy and of life, of St. Ignatius and the Jesuits in apostolic activity of St. Francis Xavier in foreign missions, and of St. Teresa in the purely contemplative life which lies behind them all. But these were not the only names nor was it a movement of a few only; the whole Church emerged from the 15th century purified and revivified. On the other hand, it was a reformation rather than a restoration; the unity of western Christendom was destroyed; the Church militant (those still on earth) led by the Company of Jesus adopted offence as the best means of defence and, though she gained as much as she lost in some sense, the Church did not recover the exercise of her former spiritual supremacy in actuality.

from Modern Catholic Dictionary by John A. Hardon, S.J. Doubleday & Co., Inc. Garden City, NY 1980

A period of Catholic revival from 1522 to about 1648, better know as the Catholic Reform. It was an effort to stem the tide of Protestantism by genuine reform within the Catholic Church. There were political movements pressured by civil rules, and ecclesiastical movements carried out by churchmen in an attempt to restore genuine Catholic life by establishing new religious orders such as the Society of Jesus and restoring old orders to their original observances, such as the Carmelites under St. Teresa of Avila (1515-98). The main factors responsible for the Counter Reformation, however, were the papacy and the council of Trent (1545-63). Among church leaders St. Charles Borromeo (1538-84), Archbishop of Milan, enforced the reforms decreed by the council, and St. Francis de Sales of Geneva (1567-1622) spent his best energies in restoring genuine Catholic doctrine and piety. Among civil rulers sponsoring the needed reform were Philip II of Spain (1527-98) and Mary Tudor (1516-58), his wife, in England. Unfortunately this aspect of the reformation led to embitterment between England and Scotland, England and Spain, Poland and Sweden, and to almost two centuries of religious wars. As a result of the Counter Reformation, the Catholic Church became stronger in her institutional structure, more dedicated to the work of evangelization, and more influential in world affairs.

Answer 2

It depends WHICH reformers you're talking about!

Vatican II (in the 1960's) was completely different from Martin Luther (in the 1520's), even though they were both trying to reform the Roman Catholic church.

You'll have to be a lot more specific with your question before you can get a meaningful answer. Which reformers, and when?