( ( ( ( ( A calorie ) , ) ( quite simply ) ) , ) ( ( is ( ( a unit ) ( of energy ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN calorie)) (, ,) (NP (RB quite) (RB simply)) (, ,)) (VP (VBZ is) (NP (NP (DT a) (NN unit)) (PP (IN of) (NP (NN energy))))) (. .)))
A calorie, quite simply, is a unit of energy .
(ROOT (S (NP (NP (DT Another) (NN unit)) (PP (IN of) (NP (NN energy))) (, ,) (VP (VBN used) (ADVP (RB widely)) (PP (IN in) (NP (NP (DT the) (NN health) (NNS professions)) (CC and) (NP (JJ everyday) (NN life))))) (, ,)) (VP (VBZ is) (ADJP (JJ calorie)) (PRN (-LRB- -LRB-) (NP (NN cal)) (-RRB- -RRB-))) (. ?)))