Complex sentence: It has deep canyons like the ones formed by the Ocoña and Majes rivers as opposed to medium-altitude plateaus such as La Joya, and high-altitude ones such the Arrieros Pampa and those located in the zones of Chivay, Huambo and Pichucolla.
Split into simpler sentences: It has deep canyons such as the ones formed by the Ocoña and Majes rivers. Plateaus range in height from medium, such as La Joya, and high-altitude ones such the Arrieros Pampa and those located in the zones of Chivay, Huambo and Pichucolla.