Complex sentence: Ryback shuts down "Missouri" s weapon systems to allow the incoming Navy SEALs to land, but the submarine crew shoots down the helicopter carrying the Navy SEALs with shoulder-fired surface-to-air missiles.
Split into simpler sentences: Ryback shuts down "Missouri" s weapon systems to allow the incoming Navy SEALs to land. However, the submarine crew shoots down the helicopter carrying the Navy SEALs with shoulder-fired surface-to-air missiles.