Complex sentence: The religious disputes which had characterized Maryland politics in earlier years were subdued under Calvert's rule, even though rules forbidding the practice of Roman Catholicism were relaxed, and in general religious conflict was much reduced.
Split into simpler sentences: The religious disputes which had characterized Maryland politics in earlier years were subdued under Calvert's rule. Rules forbidding the practice of Roman Catholicism were relaxed and, in general, religious conflict was much reduced.