In the heart of the 40,000-square-mile plateau is a geological spectacle where millions of years of weather and the chiseling force of the Colorado River have created a labyrinth of pinnacles, chasms, arches, gorges, and canyons.
(millions of years of weather and the chiseling force of the Colorado River; have created; a labyrinth of pinnacles, chasms, arches, gorges, and canyons)
millions of years of weather and the chiseling force of the Colorado River
have created
a labyrinth of pinnacles, chasms, arches, gorges, and canyons