Complex sentence: Downstream of the dam, the Mojave River flows north and east, underground in most places, through Hesperia, Victorville, and Barstow, ending at the Mojave River Wash at the western edge of Mojave National Preserve.
Split into simpler sentences: Downstream of the dam, the Mojave River flows north and east, underground in most places, through Hesperia, Victorville, and Barstow. The Mojave River ends at the Mojave River Wash at the western edge of Mojave National Preserve.