Complex sentence: There were remarkably low rates of premarital conceptions and illegitimate births amongst Huguenots in seventeenth century France compared to the rates amongst their Roman Catholic opponents, indicating how they had internalised values that condemned premarital sex as immoral.
Split into simpler sentences: There were remarkably low rates of premarital conceptions and illegitimate births amongst Huguenots in seventeenth century France compared to the rates amongst their Roman Catholic opponents. This indicates how the Calvinists had internalised values that condemned premarital sex as immoral.