Complex sentence: The division had a number of objectives; to capture the Cane canal bridge and the Orne river bridge, and at the same time to destroy the Merville gun battery and bridges crossing the River Dives.
Split into simpler sentences: The division had a number of objectives; to capture the Cane canal bridge and the Orne river bridge. And at the same time destroy the Merville gun battery and bridges crossing the River Dives.