Complex sentence: Its first combat patrol came on 12 November, early in Operation Crusader as a fighter-bomber squadron and the squadron remained in Egypt to take part in all of the desert battles from Operation Crusader to El Alamein.
Split into simpler sentences: Its first combat patrol came on 12 November, early in Operation Crusader as a fighter-bomber squadron. The squadron remained in Egypt to take part in all of the desert battles from Operation "Crusader" to El Alamein.