Please fix up logic errors in the given paragraph:
The K'iche' tended to place their newly installed ruling elite in a mountain-top fortress securing the population in the valleys below. Substantial portions of the original Mam population remained in place in the plateau area.
The K'iche' tended to place their newly installed ruling elite in a mountain-top fortress securing the population in the valleys below. However, substantial portions of the original Mam population remained in place in the plateau area.