Complex sentence: The Ganga basin is a part of the composite Ganga-Brahmaputra-Meghna basin draining 1,086,000 square kilometres in China, Nepal, India and Bangladesh.
Split into simpler sentences: The Ganga basin is a part of the composite Ganga-Brahmaputra-Meghna basin, which drains an area of 1,086,000 square kilometres. The basin lies in China, Nepal, India and Bangladesh.