( They ( ( ( ( ( synthesize ( ( ( ( organic compounds ) , ) ( primarily carbohydrates ) ) , ) ) ( from ( ( ( ( ( simple substances ) , ) ( carbon dioxide ) ) and ) water ) ) ) , ) ( substances ( that ( ( in themselves ) ( , ( ( do not ) ( contain ( any calories ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VB synthesize) (NP (NP (JJ organic) (NNS compounds)) (, ,) (ADJP (RB primarily) (JJ carbohydrates)) (, ,)) (PP (IN from) (NP (NP (JJ simple) (NNS substances)) (, ,) (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water)))) (, ,) (NP (NP (NNS substances)) (SBAR (WHNP (WDT that)) (S (PP (IN in) (NP (PRP themselves))) (, ,) (VP (VBP do) (RB not) (VP (VB contain) (NP (DT any) (NNS calories)))))))) (. .)))
They synthesize organic compounds, primarily carbohydrates, from simple substances, carbon dioxide and water, substances that in themselves, do not contain any calories.
(ROOT (S (NP (NP (NNP Organic) (NNS substances)) (, ,) (PP (VBG including) (NP (NNS proteins) (, ,) (NNS carbohydrates) (, ,) (CC and) (NNS oils))) (, ,)) (VP (VBP contain) (NP (NN carbon))) (. .)))