( Ozone ( ( is ( ( a molecule ) ( composed ( of ( ( three atoms ) ( of oxygen ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Ozone)) (VP (VBZ is) (NP (NP (DT a) (NN molecule)) (VP (VBN composed) (PP (IN of) (NP (NP (CD three) (NNS atoms)) (PP (IN of) (NP (NN oxygen)))))))) (. .)))
Ozone is a molecule composed of three atoms of oxygen.
(ROOT (S (NP (CD Three) (NN oxygen) (NNS ions)) (VP (VBP make) (PRT (RP up)) (NP (DT an) (NN ozone) (NN molecule))) (. .)))