One is that the soil can remove some substances from the water, thus helping to purify the water.
(One; is; that the soil can remove some substances from the water, thus helping to purify the water) Context(One is,List([0, 6))):(the soil; can remove; some substances; from the water)
One is,List([0, 6))
One the soil
is can remove
that the soil can remove some substances from the water, thus helping to purify the water
some substances from the water