Once in the environment, this chlorine can combine with organic materials present in water and soil to form carcinogenic substances called trihalomethanes.
(this chlorine; can combine; with organic materials present in water and soil; T:Once in the environment) (carcinogenic substances; called; trihalomethanes)
this chlorine carcinogenic substances
can combine called
with organic materials present in water and soil T:Once in the environment
trihalomethanes