Ten million years later, the Rocky Mountains became elevated, and this land to their east became a gradual slope that funneled off much of the water and created deep grooves in the earth's surface.
(the Rocky Mountains; became; elevated; T:Ten million years later) (the Rocky Mountains; elevated; ) (this land to their east; became; a gradual slope that funneled off much of the water and created deep grooves in the earth's surface) (a gradual slope; funneled off; much of the water) (a gradual slope; created; deep grooves; L:in the earth's surface)
the Rocky Mountains the Rocky Mountains this land to their east a gradual slope a gradual slope
became elevated became funneled off created
elevated T:Ten million years later
a gradual slope that funneled off much of the water and created deep grooves in the earth's surface
much of the water
deep grooves L:in the earth's surface