Complex sentence: The Bombardment of Cherbourg was a naval attack by ships of the United States Navy and Royal Navy on June 25,1944, in support of United States Army units engaged in the Battle of Cherbourg.
Split into simpler sentences: The Bombardment of Cherbourg was a naval attack by ships of the United States Navy and Royal Navy on June 25,1944. The attack was in support of United States Army units engaged in the Battle of Cherbourg.