Complex sentence: Hakkas continued to play prominent roles during the revolutionary and republican years of the Kuomintang, as well as during the Chinese Civil War between the Kuomintang and the Communist Party of China, in which many of the leaders on both sides were Hakkas.
Split into simpler sentences: Hakkas continued to play prominent roles during the revolutionary and republican years of the Kuomintang. During the Chinese Civil War between the Kuomintang and the Communist Party of China, many of the leaders on both sides were Hakkas.