Complex sentence: Karnali Highway is a highway, is a vital transport link as it is the main flow of goods between the two regions in Nepal linking the towns of Jumla, the Karnali capital, and Surkhet.
Split into simpler sentences: Karnali Highway is a highway, and is a vital transport link between two regions in Nepal. This highway links the towns of Jumla, the Karnali capital, and Surkhet.