Complex sentence: When US Jet Aircraft arrived on scene, hours later, the enemy aircraft had departed, and the US Jets attacked the Boston and Hobart, the USS Boston suffered no casualties, and was only slightly damaged in the attack.
Split into simpler sentences: When US Jet Aircraft arrived on the scene, hours later, the enemy aircraft had departed, and the US Jets attacked the Boston and Hobart. The USS Boston suffered no casualties, and was only slightly damaged in the attack.