( Proteins ( ( are ( ( large ( complex molecules ) ) ( made ( of ( ( ( hundreds or ) thousands ) ( of ( ( smaller molecules ) ( called ( amino acids ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (NP (NP (JJ large) (JJ complex) (NNS molecules)) (VP (VBN made) (PP (IN of) (NP (NP (NNS hundreds) (CC or) (NNS thousands)) (PP (IN of) (NP (NP (JJR smaller) (NNS molecules)) (VP (VBN called) (NP (JJ amino) (NNS acids)))))))))) (. .)))
Proteins are large complex molecules made of hundreds or thousands of smaller molecules called amino acids.
(ROOT (S (NP (DT A) (NN protein)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (JJ small) (NNS molecules)) (VP (VBN called) (NP (JJ amino) (NNS acids)))))))) (. .)))