Complex sentence: The Appalachian Trail crosses most of Roan's crest, with the Roan High Knob Shelter being the highest backcountry shelter on the entire 2,174-mile trail.
Split into simpler sentences: The Appalachian Trail crosses most of the Roan's crest. The Roan High Knob Shelter is the highest backcountry shelter on the entire 2,174-mile trail.