Complex sentence: Chamalang Coal Mines are extended over in the districts of Kohlu, Barkhan, and mostly concentrated in Loralai and expands over an area of 500 square miles.
Split into simpler sentences: Chamalang Coal Mines are extended over in the districts of Kohlu, Barkhan, and mostly concentrated in Loralai. It expands over an area of 500 square miles.