Marble Canyon was eroded by the waters of Grand Lake, while the Grand Canyon was eroded by the waters of both Grand and Hopi Lakes.
(Marble Canyon; was eroded; by the waters of Grand Lake) (the Grand Canyon; was eroded; by the waters of both Grand and Hopi Lakes)
Marble Canyon the Grand Canyon
was eroded was eroded
by the waters of Grand Lake
by the waters of both Grand and Hopi Lakes