As glaciers move through valleys they tend to change them into a characteristic U-shaped through abrasion and plucking.
(glaciers; move; through valleys) (they; tend; to change them into a characteristic) (they; to change; them; into a characteristic) (a characteristic; U-shaped; )
glaciers they they a characteristic
move tend to change U-shaped
through valleys
to change them into a characteristic
them into a characteristic