( Some ( ( ( ( have ( only ( a ( light reflex ) ) ) ) and ) ( can ( see ( only ( ( light and ) dark ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some)) (VP (VP (VBP have) (NP (RB only) (DT a) (JJ light) (NN reflex))) (CC and) (VP (MD can) (VP (VB see) (ADJP (RB only) (JJ light) (CC and) (JJ dark))))) (. .)))
Some have only a light reflex and can see only light and dark.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (DT the) (JJ only) (NN light)) (SBAR (IN that) (S (NP (NNS people)) (VP (MD can) (VP (VB see) (NP (JJ visible) (NN light))))))) (. .)))