( ( Element ( A substance ) ) ( ( comprised ( of ( ( only ( one kind ) ) ( of atom ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Element)) (NP (DT A) (NN substance))) (VP (VBN comprised) (PP (IN of) (NP (NP (RB only) (CD one) (NN kind)) (PP (IN of) (NP (NN atom)))))) (. .)))
Element A substance comprised of only one kind of atom.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (NP (JJ only) (NNS atoms)) (PP (IN of) (NP (NP (CD one) (NN type)) (PP (IN of) (NP (NN element) (NN native) (NNS elements))))))))))) (. .)))