( ( In ( the process ) ) ( , ( plants ( ( ( ( release oxygen ) and ) ( provide ( ( food and ) materials ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (NN process))) (, ,) (NP (NNS plants)) (VP (VP (VB release) (NP (NN oxygen))) (CC and) (VP (VB provide) (NP (NN food) (CC and) (NNS materials)))) (. .)))
In the process, plants release oxygen and provide food and materials.
(ROOT (S (NP (NNS Plants)) (VP (CONJP (RB not) (JJ only)) (VP (VBP contribute) (NP (NN food))) (CC but) (VP (VBD oxygen) (PP (IN for) (NP (NNS organisms))))) (. .)))