Complex sentence: On the night of 23/24 September 1943 Darmstadt was bombed by 21 Avro Lancasters and 8 De Havilland Mosquitos of No.8 Group RAF as a diversionary raid to draw night fighters away from the main 628-aircraft raid on Mannheim.
Split into simpler sentences: On the night of 23/24 September 1943 Darmstadt was bombed by 21 Avro Lancasters and 8 De Havilland Mosquitos of No.8 Group RAF. Although it was a diversionary raid to draw night fighters away from the main 628-aircraft raid on Mannheim.