( Again ( , ( ( the ( ultimate ( energy source ) ) ) ( ( is ( sunlight ( harnessed ( by plants ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Again)) (, ,) (NP (DT the) (JJ ultimate) (NN energy) (NN source)) (VP (VBZ is) (NP (NP (NN sunlight)) (VP (VBN harnessed) (PP (IN by) (NP (NNS plants)))))) (. .)))
Again, the ultimate energy source is sunlight harnessed by plants.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN food) (POS 's)) (NN chemical) (NN energy)))) (ADVP (RB ultimately)) (VP (VBZ comes) (PP (IN from) (NP (NN sunlight)))) (. .)))