Complex sentence: The United States Eighth Fleet, established 15 March 1943 from Northwest African Force, operated in the Mediterranean Sea during World War II with a main mission of amphibious warfare.
Split into simpler sentences: The United States Eighth Fleet was a fleet of the U.S. Navy established 15 March 1943 from Northwest African Force. It operated in the Mediterranean Sea during World War II with a main mission of amphibious warfare.