( ( Solar energy ) ( ( is ( nuclear energy ) ) . ) )
(ROOT (S (NP (NNP Solar) (NN energy)) (VP (VBZ is) (NP (JJ nuclear) (NN energy))) (. .)))
Solar energy is nuclear energy.
(ROOT (S (NP (NP (DT The) (NN energy)) (PP (IN in) (NP (NN sunlight)))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN known) (PP (IN as) (NP (JJ solar) (NN energy))))) (. .)))