Complex sentence: Since the end of the 19th Century, however, the theory has increasingly come under attack and today has been largely discredited, and yet continued to be the prevailing view among Baptists of the South into the latter 20th century.
Split into simpler sentences: Since the end of the 19th Century, however, the theory has increasingly come under attack and today has been largely discredited. Nonetheless, the view continued to be the prevailing view among Baptists of the U.S. South into the latter 20th century.