Completely refashioning the lay of the land, glaciers hewed out a series of 17 individual mountains separated by U-shaped valleys running from north to south.
(glaciers; hewed out; a series of 17 individual mountains) (17 individual mountains; separated; by U-shaped valleys) (U-shaped valleys; running; )
glaciers 17 individual mountains U-shaped valleys
hewed out separated running
a series of 17 individual mountains
by U-shaped valleys