Complex sentence: The AAF had developed an excess of pilots and pilot candidates, and as a result, Arnold (who had been a proponent of militarization) ordered that the WASP be disbanded by December 20,1944.
Split into simpler sentences: The AAF had developed an excess of pilots and pilot candidates. As a result, Arnold (who had been a proponent of militarization) ordered that the WASP be disbanded by December 20,1944.