( Hydrolysis ( ( ( gives oxygen ) ( ( gas and ) base ) ) : ) )
(ROOT (S (NP (NNS Hydrolysis)) (VP (VBZ gives) (NP (NN oxygen)) (NP (NN gas) (CC and) (NN base))) (: :)))
Hydrolysis gives oxygen gas and base:
(ROOT (S (NP (NN Oxygen) (NN gas)) (VP (VBZ is) (VP (VBN given) (PRT (RP off)) (PP (IN by) (NP (NNS plants))))) (. .)))