Complex sentence: On 18 July, I Corps conducted an advance to secure villages and the eastern flank of VIII Corps and on the western flank, the II Canadian Corps conducted Operation Atlantic to capture the remaining German positions in Caen south of the Orne.
Split into simpler sentences: On 18 July, I Corps conducted an advance to secure villages and the eastern flank of VIII Corps. On the western flank, II Canadian Corps conducted Operation Atlantic to capture the remaining German positions in Caen south of the Orne.