Complex sentence: By noon, as the artillery fire took its toll and the Germans started to run out of ammunition, the Americans were able to clear some lanes on the beaches and start clearing the draws of enemy defences so that vehicles could move off the beach.
Split into simpler sentences: By noon, as the artillery fire took its toll and the Germans started to run out of ammunition, the Americans were able to clear some lanes on the beaches. They also started clearing the draws of enemy defences so that vehicles could move off the beach.