( Fermentation ( ( ( ( allows ( a ( cell ( to ( continue ( to ( synthesize ATP ) ) ) ) ) ) ) , ) ( by ( ( the breakdown ) ( of ( ( nutrients , ) ( when ( oxygen ( ( is not ) present ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Fermentation)) (VP (VBZ allows) (NP (DT a) (NN cell) (S (VP (TO to) (VP (VB continue) (S (VP (TO to) (VP (VB synthesize) (NP (NNP ATP))))))))) (, ,) (PP (IN by) (NP (NP (DT the) (NN breakdown)) (PP (IN of) (NP (NP (NNS nutrients)) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NN oxygen)) (VP (VBZ is) (RB not) (ADJP (JJ present)))))))))) (. .)))
Fermentation allows a cell to continue to synthesize ATP, by the breakdown of nutrients, when oxygen is not present.
(ROOT (S (NP (NNP Fermentation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (PP (IN of) (S (VP (VBG making) (NP (NN atp)) (PP (IN without) (NP (NN oxygen)))))))) (. .)))