Complex sentence: Stripped of his military power, Feng spent the early 1930s criticizing Chiang's failure to resist Japanese aggression, between 1937 and 1945, however, he supported the KMT and held positions in the Nationalist government.
Split into simpler sentences: Stripped of his military power, Feng spent the early 1930s criticizing Chiang's failure to resist Japanese aggression. Between 1937 and 1945, however, he supported the KMT and held positions in the Nationalist government.