Complex sentence: In 1929, Communist leader Zhou Enlai asked Qian to join the wireless radio training class in Shanghai run by Xu Enzeng, the head of the Kuomintang's Investigation Department, to recruit special agents for the department.
Split into simpler sentences: In 1929, Communist leader Zhou Enlai asked Qian to join Xu Enzeng's wireless radio training class in Shanghai. Xu was the head of the Kuomintang's Investigation Department, and the purpose of the class was to recruit special agents for the department.