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