Complex sentence: Following the invasion of Jehol in February, 1933, Fang Zhenwu joined the Anti Japanese National Salvation movement, and organized the movements forces in China and led them north to confront the Japanese.
Split into simpler sentences: Following the invasion of Jehol in February 1933, Fang Zhenwu joined the Anti-Japanese National Salvation movement. He organized the movement's forces in China and led them north to confront the Japanese.