Complex sentence: Anabaptists are considered to have begun with the Radical Reformers in the 16th century, but historians classify certain people and groups as their forerunners because of a similar approach to the interpretation and application of the Bible.
Split into simpler sentences: Anabaptists are considered to have begun with the Radical Reformers in the 16th century. But historians classify certain people and groups as their forerunners because of a similar approach to the interpretation and application of the Bible.