Complex sentence: The unit supported the invasion of Normandy in June 1944 by bombing airfields and other targets, and the group aided in the breakthrough at St. Lo, France, and the effort to take Brest, France, from July to September 1944.
Split into simpler sentences: The unit supported the invasion of Normandy in June 1944 by bombing airfields and other targets. The squadron aided in the breakthrough at St. Lo, France, and the effort to take Brest, France, from July to September 1944.