Complex sentence: Nepal has active expatriate Scout groups, among these are American Boy Scouts in Kathmandu, the Direct Service Pack and Troop 900, sponsored by the Lincoln School, linked to the Direct Service branch of the Boy Scouts of America, which supports units around the world.
Split into simpler sentences: Nepal has active expatriate Scout groups, some of which are the American Boy Scouts in Kathmandu, the Direct Service Pack and Troop 900. These are sponsored by the Lincoln School and linked to the Direct Service branch of the Boy Scouts of America, which supports units around the world.