Complex sentence: The largest group, of over 10,000, is located in the Helambu and Melamchi valleys to the northeast of Kathmandu, and there is a separate group of about 700 in the Lamjung district near Pokhara.
Split into simpler sentences: The largest group, of over 10,000, is located in the Helambu and Melamchi valleys to the northeast of Kathmandu. A separate group of about 700 reside in the Lamjung district near Pokhara.