( ( ( ( ( Eyes ( open widely ) ) ( , ( ( pupils dilate ) , ) ) ) and ) ( ( ( head and ) eyes ) ( turn ( to ( the ( opposite side ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Eyes)) (VP (VBP open) (ADVP (RB widely)))) (PRN (, ,) (S (NP (NNS pupils)) (VP (VBP dilate))) (, ,)) (CC and) (S (NP (NN head) (CC and) (NNS eyes)) (VP (VBP turn) (PP (TO to) (NP (DT the) (JJ opposite) (NN side))))) (. .)))
Eyes open widely, pupils dilate, and head and eyes turn to the opposite side.
(ROOT (S (NP (DT The) (NN pupil)) (VP (VBZ is) (NP (NP (DT the) (NN opening)) (PP (IN in) (NP (NP (DT the) (NN front)) (PP (IN of) (NP (DT the) (NN eye))))))) (. .)))