When the water freezes, it expands, causing the rock to break apart.
(the water; freezes; ) (it; expands; T:When the water freezes) (it; causing; the rock to break apart) Context(it causing,List([24, 43))):(the rock; to break; apart)
it causing,List([24, 43))
the water it it the rock
freezes expands causing to break
T:When the water freezes
the rock to break apart
apart