( ( Most ( of ( ( the ( chemical energy ) ) ( in food ) ) ) ) ( ( ( comes ultimately ) ( from ( ( the energy ) ( in sunlight ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (JJ chemical) (NN energy)) (PP (IN in) (NP (NN food)))))) (VP (VBZ comes) (ADVP (RB ultimately)) (PP (IN from) (NP (NP (DT the) (NN energy)) (PP (IN in) (NP (NN sunlight)))))) (. .)))
Most of the chemical energy  in food comes ultimately from the energy in sunlight.
(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)))) (. .)))