Complex sentence: In Assam the major rivers are Brahmaputra and Manas, and in northern West Bengal the major river is the Teesta besides many others like the Jaldhaka, Torsha, Sankosh, Dyna, Karatowa among others.
Split into simpler sentences: In Assam the major river are Brahmaputra and Manas, but in northern West Bengal the major river is the Teesta. And there are many others like the Jaldhaka, Torsha, Sankosh, Dyna, Karatowa among others.