( ( ( ( ( ( The eyes ) ( are ( wide open ) ) ) , ) and ) ( ( their pupils ) dilated ) ) . )
(ROOT (S (S (NP (DT The) (NNS eyes)) (VP (VBP are) (ADJP (RB wide) (JJ open)))) (, ,) (CC and) (S (NP (PRP$ their) (NNS pupils)) (VP (VBD dilated))) (. .)))
The eyes are wide open, and their pupils dilated.
(ROOT (S (NP (NP (DT The) (NN opening)) (PP (IN in) (NP (NP (DT the) (NN front)) (PP (IN of) (NP (DT the) (NN eye)))))) (VP (VBZ is) (VP (VBN called) (NP (NN pupil)))) (. .)))