( ( Of ( ( the energy ) ( that ( is ( ( trapped ( in sugars ) ) ( by photosynthesis ) ) ) ) ) ) ( , ( ( only some ) ( ( is ( stored ( in ( ( plants ( as tissue ) ) ( which ( is ( potentially ( available ( to heterotrophs ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Of) (NP (NP (DT the) (NN energy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN trapped) (PP (IN in) (NP (NNS sugars))) (PP (IN by) (NP (NN photosynthesis))))))))) (, ,) (NP (RB only) (DT some)) (VP (VBZ is) (VP (VBN stored) (PP (IN in) (NP (NP (NNS plants)) (PP (IN as) (NP (NN tissue))) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (RB potentially) (JJ available) (PP (TO to) (NP (NNS heterotrophs))))))))))) (. .)))
Of the energy that is trapped in sugars by photosynthesis, only some is stored in plants as tissue which is potentially available to heterotrophs.
(ROOT (S (NP (DT The) (NN heterotroph)) (VP (VBZ eats) (NP (UCP (ADJP (JJ only)) (CC or) (ADVP (RB mainly))) (NNS plants))) (. .)))