Complex sentence: El Morro's last active fight occurred during a naval bombardment by the United States Navy during the 1898 Spanish-American War, ending the age of naval warfare in the Caribbean, at least in the classical sense.
Split into simpler sentences: El Morro's last active fight occurred during a naval bombardment by the United States Navy during the 1898 Spanish-American War. Ending the age of naval warfare in the Caribbean, at least in the classical sense.