Simplify the following text for a Grade 4 native English-speaking person.
Original: The uplift of the Colorado Plateau is uneven , and the Kaibab Plateau that Grand Canyon bisects is over a thousand feet higher at the North Rim ( about 1000 f ) than at the South Rim . Almost all runoff from the North Rim ( which also gets more rain and snow ) flows toward the Grand Canyon , while much of the runoff on the plateau behind the South Rim flows away from the canyon ( following the general tilt ) .
Simplified: There are trails leading from the North Rim and the South Rim to the bottom of the canyon .