( ( The ( optic nerve ) ) ( ( ( transfers images ) ( from ( ( the eyes ) ( to ( ( ( the brain ) , ) ( which ( allows ( us ( to see ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ optic) (NN nerve)) (VP (VBZ transfers) (NP (NNS images)) (PP (IN from) (NP (NP (DT the) (NNS eyes)) (PP (TO to) (NP (NP (DT the) (NN brain)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ allows) (S (NP (PRP us)) (VP (TO to) (VP (VB see)))))))))))) (. .)))
The optic nerve transfers images from the eyes to the brain, which allows us to see.
(ROOT (S (NP (NNS Brain) (CC and) (NNS eyes)) (VP (VBP are) (S (NP (DT the) (NNS organs)) (VP (VB work) (PRT (RP together)) (S (VP (TO to) (VP (VB allow) (S (NP (PRP us)) (VP (TO to) (VP (VB see)))))))))) (. .)))