( ( Ozone molecules ) ( ( are ( ( made up ) ( of ( ( three atoms ) ( of oxygen ) ) ) ) ) . ) )
(ROOT (S (NP (NN Ozone) (NNS molecules)) (VP (VBP are) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (CD three) (NNS atoms)) (PP (IN of) (NP (NN oxygen))))))) (. .)))
Ozone molecules are made up 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))) (. .)))