The flooding of the river has helped make this valley fertile.
(The flooding of the river; has helped; make this valley fertile) Context(The flooding of the river has helped,List([0, 36))):(The flooding of the river; has helped make; this valley fertile)
The flooding of the river has helped,List([0, 36))
The flooding of the river The flooding of the river
has helped has helped make
make this valley fertile
this valley fertile