( ( ( ( ( ( The pupil ) ( of ( the eye ) ) ) ( is ( ( the ( dark ( center ( ( part or ) hole ) ) ) ) ( that ( is ( shaped ( by ( the iris ) ) ) ) ) ) ) ) and ) ( that ( allows ( light ( to ( enter ( the eye ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN pupil)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ is) (NP (NP (DT the) (JJ dark) (NN center) (NN part) (CC or) (NN hole)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN shaped) (PP (IN by) (NP (DT the) (NNS iris)))))))))) (CC and) (S (NP (DT that)) (VP (VBZ allows) (ADJP (JJ light) (S (VP (TO to) (VP (VB enter) (NP (DT the) (NN eye)))))))) (. .)))
The pupil of the eye is the dark center part or hole that is shaped by the iris and that allows light to enter the eye.
(ROOT (S (NP (NP (DT The) (NN pupil)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ allows) (ADJP (JJ light) (S (VP (TO to) (VP (VB enter)))))) (. .)))
The pupil of the eye allows light to enter.