Complex sentence: Commander Carrier Strike Group Twelve (COMCARSTRKGRU 12 or CCSG 12) is responsible for unit-level training, integrated training, and material readiness for the ships and aviation squadrons assigned to the group.
Split into simpler sentences: Commander Carrier Strike Group Twelve (COMCARSTRKGRU 12 or CCSG 12) is the command authority for Carrier Strike Group Twelve. This flag officer is responsible for unit-level training, integrated training, and material readiness for the ships and aviation squadrons assigned to the group.