These are enormous U-shaped valleys carved by vanished Ice Age glaciers into the mountain's tilted plateau.
(These; are; enormous U-shaped valleys carved by vanished Ice Age glaciers into the mountain's tilted plateau) (enormous U-shaped valleys; carved; by vanished Ice Age glaciers; into the mountain's tilted plateau)
These enormous U-shaped valleys
are carved
enormous U-shaped valleys carved by vanished Ice Age glaciers into the mountain's tilted plateau
by vanished Ice Age glaciers into the mountain's tilted plateau