( ( An element ) ( ( is ( ( a substance ) ( that ( is ( composed ( of ( ( one kind ) ( of atom ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (DT An) (NN element)) (VP (VBZ is) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (CD one) (NN kind)) (PP (IN of) (NP (NN atom))))))))))) (: ;)))
An element is a substance that is composed of one kind of atom;
(ROOT (S (ADVP (DT All) (NN matter) (SBAR (IN in) (S (NP (DT the) (NN universe)) (VP (VBZ is) (UCP (VP (VBN composed) (PP (IN of) (NP (CD one)))) (CC or) (ADJP (RBR more) (JJ unique))))))) (NP (JJ pure) (NNS substances)) (VP (VBD called) (NP (NNS elements))) (. .)))