I was just referencing the great schism which birthed Roman Catholicism and, in turn, led to the Protestant reformation. Probably too broad of a statement to make but it is recognized as the official split of the East and West ( Latins).
I will say this: If the Church is the body of Christ (it is) and Hebrews 13:8 is true (it is) then the Church should be unchanged and never required a re-formation and that Church should exist today (it does).