Over many more millions of years the erosion along the course of the Colorado continued to widen the Canyon to present the vistas that you see today.
(the erosion along the course of the Colorado; continued; T:Over many more millions of years) (the erosion along the course of the Colorado; to widen; the Canyon; to present the vistas) (the vistas; see; T:today)
the erosion along the course of the Colorado the erosion along the course of the Colorado the vistas
continued to widen see
T:Over many more millions of years
the Canyon to present the vistas
T:today