Complex sentence: Each submarine had four 3,000 horsepower (2.2 MW) engines and carried enough fuel to go around the world one-and-a-half times-more than enough to reach the United States traveling east or west.
Split into simpler sentences: Each submarine had four 3,000 horsepower (2.2 MW) engines and carried enough fuel to go around the world one-and-a-half times. More than enough to reach the United States traveling east or west.