( ( The retina ) ( ( contains ( ( ( specialized ( nerve cells ) ) ( -LRB- ( ( ( ( the rods ) and ) cones ) -RRB- ) ) ) ( that ( ( convert ( light energy ) ) ( into ( nerve impulses ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN retina)) (VP (VBZ contains) (NP (NP (NP (VBN specialized) (NN nerve) (NNS cells)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (NNS rods)) (CC and) (NP (NNS cones))) (-RRB- -RRB-))) (SBAR (WHNP (WDT that)) (S (VP (VBP convert) (NP (JJ light) (NN energy)) (PP (IN into) (NP (NN nerve) (NNS impulses)))))))) (. .)))
The retina contains specialized nerve cells (the rods and cones ) that convert light energy into nerve impulses .
(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)))) (. .)))