Complex sentence: The Bombardment of Orleans, in July 1918 was a naval and air action during the First World War, an Imperial German U-boat opened fire on the town of Orleans, Massachusetts and several merchant vessels nearby.
Split into simpler sentences: The Bombardment of Orleans, in July 1918 was a naval and air action during the First World War. An Imperial German U-boat opened fire on the American town of Orleans, Massachusetts and several merchant vessels nearby.