Complex sentence: Due to this tactical mistake, the Wei troops led by Zhang He encircled the hill and cut off the water supply to the Shu troops and attacked; later, Sima Yi's forces set fire to the hill.
Split into simpler sentences: Due to this tactical mistake, the Wei troops led by Zhang He encircled the hill and cut off the water supply to the Shu troops. Later Sima Yi's forces set fire to the hill.