( ( ( Ozone or ) O3 ) ( , ( ( is ( ( three molecules ) ( of oxygen ) ) ) ; ) ) )
(ROOT (S (NP (NNP Ozone) (CC or) (NNP O3)) (, ,) (VP (VBZ is) (NP (NP (CD three) (NNS molecules)) (PP (IN of) (NP (NN oxygen))))) (: ;)))
Ozone or O3, is three molecules of oxygen;
(ROOT (S (NP (CD Three) (NN oxygen) (NNS ions)) (VP (VBP make) (PRT (RP up)) (NP (DT an) (NN ozone) (NN molecule))) (. .)))