Complex sentence: A Company, PIB under the command of Captain Ernest Hitchcock was the first company to return to action on 30 May 1943, subsequently came under the command of the US 41st Division for operations at Nassau Bay.
Split into simpler sentences: A Company, PIB under the command of Captain Ernest Hitchcock was the first company to return to action. Departing on 30 May 1943, it subsequently come under the command of the US 41st Division for operations at Nassau Bay.