Main reason why Roman and Catholic Church was split?

Ah, not sure what you are asking here. The "Roman" Church usually is the Anglican way of referring to the Catholic Church as the Pope, who is Christ's Vicar on earth, and thus head of the Catholic Church, is the Bishop of Rome. Thus if you are using "Roman Church" in that way, it is the same thing as the Catholic Church. If you are not using Roman to refer to the Catholic Church, then you will have to reword you question as I have no idea what you're talking about.