Complex sentence: There were also some missions which produced an almost 100% casualty rate amongst the Blenheims; one such operation was mounted on 13 August 1940 against a "Luftwaffe" airfield near Aalborg in north-western Denmark by 12 aircraft of 82 Squadron.
Split into simpler sentences: There were also some missions which produced an almost 100% casualty rate amongst the Blenheims. One such operation was mounted on 13 August 1940 against a "Luftwaffe" airfield near Aalborg in north-western Denmark by 12 aircraft of 82 Squadron.