Complex sentence: The Mogollon Rim (pronounced by local residents) is a topographical and geological feature running across Arizona, extending approximately 400 miles (650 km) from northern Yavapai County eastward to the Mogollon Mountains in southwest New Mexico.
Split into simpler sentences: The Mogollon Rim (pronounced by local residents) is a topographical and geological feature running across the U.S. state of Arizona. It extends approximately 400 miles (650 km) from northern Yavapai County eastward to the Mogollon Mountains in southwest New Mexico.