Complex sentence: The term Patayan is used by archaeologists to describe the prehistoric Native American cultures that inhabited parts of modern day Arizona, California and Baja California, including areas near the Colorado River Valley, the nearby uplands, and north to the vicinity of the Grand Canyon.
Split into simpler sentences: The term Patayan is used by archaeologists to describe the prehistoric Native American cultures who inhabited parts of modern day Arizona, California and Baja California. These areas included territory near the Colorado River Valley, the nearby uplands, and north to the vicinity of the Grand Canyon.