Complex sentence: The population of the Nùng is estimated to be more than 700,000, located in the provinces of Bac Giang, Bac Kan, Cao Bang, Lang Son, Thau Nguyen, and Tuyen Quang.
Split into simpler sentences: The population of the Nùng is estimated to be more than 700,000. They are located primarily in the provinces of Bac Giang, Bac Kan, Cao Bang, Lang Son, Thau Nguyen, and Tuyen Quang.