Complex sentence: Carrier Strike Group Twelve, abbreviated CSG-12 or CARSTRKGRU 12, is a U.S. Navy carrier strike group currently assigned to the United States Fleet Forces Command.
Split into simpler sentences: Carrier Strike Group Twelve, abbreviated CSG-12 or CARSTRKGRU 12, is a U.S. Navy carrier strike group. It is currently assigned to the United States Fleet Forces Command.