Complex sentence: It followed the First Battle of El Alamein, which had stalled the Axis advance into Egypt, after which, in August 1942, Lieutenant-General Bernard Montgomery had taken command of the British Eighth Army from General Claude Auchinleck.
Split into simpler sentences: It followed the First Battle of El Alamein, which had stalled the Axis Powers advance into Egypt. After which, in August 1942, Lieutenant-General Bernard Montgomery had taken command of the British Eighth Army from General Claude Auchinleck.