Complex sentence: After the meeting in September Liu Guitang changed sides, being given the title of Bandit Suppression Commander of Eastern Chahar, commandng three regiments stationed at Chicheng, Dushikou and Yunzhou.
Split into simpler sentences: After the meeting in September Liu Guitang changed sides. He was given the title of Bandit Suppression Commander of Eastern Chahar, and given the command of three regiments stationed at Chicheng, Dushikou and Yunzhou.