Complex sentence: On 23 October, the British offensive and the Second Battle of El Alamein began, the Germans were overwhelmed and the 21st Panzer would be down to only four tanks by 7 November.
Split into simpler sentences: On 23 October, the British offensive and the Second Battle of El Alamein began. The Germans were overwhelmed and 21st Panzer was reduced to only four tanks by 7 November.