( ( Oxidation ( ( Any ( chemical reaction ) ) ( ( in which ) ( oxygen ( combines ( with ( another substance ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Oxidation) (NP (NP (DT Any) (JJ chemical) (NN reaction)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NN oxygen)) (VP (VBZ combines) (PP (IN with) (NP (DT another) (NN substance)))))))) (. .)))
Oxidation Any chemical reaction in which oxygen combines with another substance.
(ROOT (S (NP (DT A) (NN combination) (NN reaction)) (VP (VBZ is) (NP (NP (DT a) (NN reaction)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (CC or) (JJR more) (NNS substances)) (VP (VBP combine) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJ single) (JJ new) (NN substance)))))))))) (. .)))