Complex sentence: Training was provided when Conventional Weapons School was formed as a department of Readiness Attack Carrier Air Wing (RCVW-4), it's mission was to provide training for A- 4 Skyhawk/A- 7 Corsair aircraft.
Split into simpler sentences: Training was provided when Conventional Weapons School was formed as a department of Readiness Attack Carrier Air Wing (RCVW-4). Its mission was to provide training for A- 4 Skyhawk/A- 7 Corsair aircraft.