Complex sentence: He was involved in the evacuation of Dunkirk in 1940 and awarded the O.B.E. His sister was Clare Leighton who became a talented woodcut artist; she wrote a biography of her mother, "Tempestuous Petticoat".
Split into simpler sentences: He was involved in the evacuation of Dunkirk in 1940, and awarded the O.B.E. His sister was Clare Leighton who became a talented woodcut artist. She wrote a biography of her mother, "Tempestuous Petticoat".