( ( ( The oxygen ) ( will ( create ( ( excess decomposition ) ( of ( the crucible ) ) ) ) ) ) ( , ( ( the hydrogen ) ( ( will ( be ( ( ( oxidized back ) ( into water ) ) ( in ( the ( copper ( oxide ( catalyst heater ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (DT The) (NN oxygen)) (VP (MD will) (VP (VB create) (NP (NP (JJ excess) (NN decomposition)) (PP (IN of) (NP (DT the) (NN crucible))))))) (, ,) (NP (DT the) (NN hydrogen)) (VP (MD will) (VP (VB be) (VP (VBN oxidized) (PRT (RP back)) (PP (IN into) (NP (NN water))) (PP (IN in) (NP (DT the) (NN copper) (NN oxide) (NN catalyst) (NN heater)))))) (. .)))
The oxygen will create excess decomposition of the crucible, the hydrogen will be oxidized back into water in the copper oxide catalyst heater.
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (NP (NP (DT an) (NN oxide)) (PP (IN of) (NP (NN hydrogen))))) (. .)))