The Grand Canyon was created by the erosion action of the Colorado River on the surface as this region has continued to rise high above sea level over the last several million years.
(The Grand Canyon; was created; by the erosion action of the Colorado River on the surface) (this region; has continued; ) (this region; to rise high; L:above sea level over the last several million years)
The Grand Canyon this region this region
was created has continued to rise high
by the erosion action of the Colorado River on the surface
L:above sea level over the last several million years