Complex sentence: Ten minutes later U- 510 surfaced, fired two bursts from her 37mm AA gun into the waterline of the bow to flood the forward holds, and then moved off on the surface in a westerly direction.
Split into simpler sentences: Ten minutes later surfaced, fired two bursts from her 37mm AA gun into the waterline of the bow to flood the forward holds, and then left the area. She then moved off on the surface in a westerly direction.