As the roots grow, they widen the cracks, eventually breaking the rock into pieces.
(the roots; grow; ) (they; widen; the cracks; T:As the roots grow) Context(they widen,List([19, 29))):(they; widen the cracks breaking; the rock; into pieces; T:eventually)
they widen,List([19, 29))
the roots they they
grow widen widen the cracks breaking
the cracks T:As the roots grow
the rock into pieces T:eventually