Complex sentence: His trigger finger is usually along the side of the gun, not on the trigger, as a safety precaution, authorities also think he wears a bulletproof vest from the outlines on his jackets.
Split into simpler sentences: His trigger finger is usually along the side of the gun, not on the trigger, as a safety precaution. Authorities also think he wears a bulletproof vest from the outlines on his jackets.