Complex sentence: It was Han Chinese Bannermen who were responsible for the successful Qing conquest of China, they made up the majority of governors in the early Qing and were the ones who governed and administered China after the conquest, stabilizing Qing rule.
Split into simpler sentences: It was Han Chinese Bannermen who were responsible for the successful Qing conquest of China. They made up the majority of governors in the early Qing and were the ones who governed and administered China after the conquest, stabilizing Qing rule.