Complex sentence: During the Second World War he was a pilot in bombers and received the Distinguished Flying Cross in 1943, was promoted Acting Wing Commander in 1944 and was awarded the Distinguished Service Order in 1945.
Split into simpler sentences: During the Second World War, he was a pilot in bombers. He received the Distinguished Flying Cross in 1943, was promoted Acting Wing Commander in 1944 and was awarded the Distinguished Service Order in 1945.