Complex sentence: The western edge of the main section of the Sacramento Mountains forms a series of dramatic escarpments leading up to a high ridge, which includes the highest point in the range, Cathey Peak, 9,645 feet (2,940 m).
Split into simpler sentences: The western edge forms a series of dramatic escarpments leading up to a ridge along the western edge of the range. This ridge includes the highest point in the range, Cathey Peak at 9645 feet (2968 m).