( ( Photosensitive cells ) ( ( called ( ( ( ( rods and ) cones ) ( in ( the retina ) ) ) ( ( convert ( incident ( light energy ) ) ) ( into ( signals ( that ( are ( ( carried ( to ( the brain ) ) ) ( by ( the ( optic nerve ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Photosensitive) (NNS cells)) (VP (VBD called) (SBAR (S (NP (NP (NNS rods) (CC and) (NNS cones)) (PP (IN in) (NP (DT the) (NN retina)))) (VP (VBP convert) (NP (NN incident) (NN light) (NN energy)) (PP (IN into) (NP (NP (NNS signals)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN carried) (PP (TO to) (NP (DT the) (NN brain))) (PP (IN by) (NP (DT the) (JJ optic) (NN nerve))))))))))))) (. .)))
Photosensitive cells called rods and cones in the retina convert incident light energy into signals that are carried to the brain by the optic nerve.
(ROOT (S (NP (NP (DT The) (JJ light-sensing) (NNS cells)) (PP (IN in) (NP (DT the) (NN retina)))) (VP (VBP are) (VP (VBN called) (NP (NNS rods) (CC and) (NNS cones)))) (. .)))