Complex sentence: Adolf Hitler's attaining power as Chancellor marked the end of numerous women's rights, even if the Nazi party owed part of its electoral success to female voters and that Hitler succeeded in his social rise in part thanks to the protection of influential women.
Split into simpler sentences: Adolf Hitler's attaining power as Chancellor marked the end of numerous women's rights, even though the Nazi party owed part of its electoral success to female voters. In fact, Hitler had succeeded in his social rise in part thanks to the protection of influential women.