Complex sentence: As the new leader of the KMT, Chiang Kai-shek, launched the Northern Expedition to unify China in 1924, the conservatives within the KMT in Nanking grew hostile to the communists, while the leftists in Wuhan were in favour of the alliance with them.
Split into simpler sentences: As the new leader of the KMT, Chiang Kai-shek, launched the Northern Expedition to unify China in 1924. Conservatives within the KMT in Nanking grew hostile to the communists, while the leftists in Wuhan were in favour of the alliance with them.