Complex sentence: At the outbreak of World War II, most members of CUAS were called up to join the RAF, and some members went on to distinguished careers in World War II with the Victoria Cross, 17 DSOs and over 70 DFCs being won.
Split into simpler sentences: At the outbreak of World War II, most members of CUAS were called up to join the RAF. Many former members went on to distinguished careers in World War II with the Victoria Cross, 17 DSOs and over 70 DFCs being won.