( ( Once ( inside ( the cell ) ) ) ( , ( ( the oxygen ) ( ( is ( ( used ( in ( cellular respiration ) ) ) ( to ( ( release ( the energy ) ) ( from glucose ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Once) (PP (IN inside) (NP (DT the) (NN cell)))) (, ,) (NP (DT the) (NN oxygen)) (VP (VBZ is) (VP (VBN used) (PP (IN in) (NP (JJ cellular) (NN respiration))) (S (VP (TO to) (VP (VB release) (NP (DT the) (NN energy)) (PP (IN from) (NP (NN glucose)))))))) (. .)))
Once inside the cell, the oxygen is used in cellular respiration to release the energy from glucose.
(ROOT (S (PP (IN As) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (JJ cellular) (NN respiration))))) (, ,) (NP (NP (NN energy)) (PP (IN for) (NP (NN cell) (NNS processes)))) (VP (VBZ is) (VP (VBN released))) (. .)))