( ( One ( of ( ( the ingredients ) ( in EMP ) ) ) ) ( ( ( ( reacts ( with ( ( the products ) ( of combustion ) ) ) ) and ) ( ( drives ( the ( combustion reactions ) ) ) ( to completion ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (NNS ingredients)) (PP (IN in) (NP (NNP EMP)))))) (VP (VP (VBZ reacts) (PP (IN with) (NP (NP (DT the) (NNS products)) (PP (IN of) (NP (NN combustion)))))) (CC and) (VP (VBZ drives) (NP (DT the) (NN combustion) (NNS reactions)) (PP (TO to) (NP (NN completion))))) (. .)))
One of the ingredients in EMP reacts with the products of combustion and drives the combustion reactions to completion.
(ROOT (S (NP (NNP Combustion) (NN reaction)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VBZ reacts) (ADVP (RB quickly)) (PP (IN with) (NP (NN oxygen))))))) (. .)))