( ( Since ( they ( get ( energy ( consuming ( other organisms ) ) ) ) ) ) ( they ( ( are ( called heterotrophs ) ) . ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (PRP they)) (VP (VBP get) (NP (NP (NN energy)) (VP (VBG consuming) (NP (JJ other) (NNS organisms))))))) (NP (PRP they)) (VP (VBP are) (VP (VBN called) (NP (NNS heterotrophs)))) (. .)))
Since they get energy consuming other organisms they are called heterotrophs.
(ROOT (S (NP (NP (NNS Organisms)) (ADJP (JJ incapable) (PP (IN of) (NP (NP (NN photosynthesis)) (SBAR (WHNP (WDT that)) (S (VP (MD must) (ADVP (RB therefore)) (VP (VB obtain) (NP (NN energy) (CC and) (NN carbon)) (PP (IN from) (NP (NN food))) (PP (IN by) (S (VP (VBG consuming) (NP (JJ other) (NNS organisms))))))))))))) (VP (VBP are) (VP (VBN called) (NP (NNS heterotrophs)))) (. .)))