Original sentence: The practice of Christianization has at times been relatively peaceful and at times has been a very violent process, ranging from political conversions to adopt Christianity to military campaigns to force conversion onto native populances
Edited sentence: Campaigns like this featured political conversions by Christian Kings to adopt Christianity as a means of breaking resistance to secular authority.Certain campaigns by secular authorities such as that implemented by Charlemagne against the Saxons in the Saxon Wars were at times a very violent process and were aimed at both imperial expansion of authority and conversion by the sword.Here, the conversion was a slow and gradual process where coercion was limited in later years by Imperial Christian authorities suppressing various schools and sects and orders of Pagan rites due to their relationship with the state.This is in contrast to the more general method throughout the entire Roman Empire, where the process of Christianization was accomplished almost entirely by evangelism.Until about the 15th century the practice of Christianization has been relatively peaceful