( ( An element ) ( ( is ( ( a type ) ( of ( matter ( composed ( of ( ( only ( one kind ) ) ( of atom ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN element)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NP (NN matter)) (VP (VBN composed) (PP (IN of) (NP (NP (RB only) (CD one) (NN kind)) (PP (IN of) (NP (NN atom)))))))))) (. .)))
An element is a type of matter composed 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))))))))))) (. .)))