Complex sentence: Lepe was also the starting point for PLUTO (Pipeline Under The Ocean) which carried fuel across the Isle of Wight and under the English Channel to the Allied forces in Normandy and beyond.
Split into simpler sentences: Lepe was also the point where PLUTO (Pipeline Under The Ocean) left the mainland. It carried fuel across the Isle of Wight and under the English Channel to the Allied forces in Normandy and beyond.