Complex sentence: The Gulf of Mannar is an arm of the Indian Ocean, lying between the southern tip of India and the west coast of Sri Lanka at a width of between 160 and 200 km (100 to 125 mi).
Split into simpler sentences: The Gulf of Mannar is a large bay that is an arm of the Indian Ocean. It lies between the southern tip of India and the west coast of Sri Lanka at a width of between 160 and 200 km (100 to 125 mi).