Complex sentence: The French Air Force, meanwhile, had become involved in the First Indochina War, so it could only bring up some old Junkers Ju 52s to support its own troops and they were too small and slow to be of much help.
Split into simpler sentences: The French Air Force, meanwhile, had become involved in the First Indochina War, so it could only bring up some old Junkers Ju 52s to support its own troops. They were too small and slow to be of much help.