( Water ( , ( ( for example ) ( , ( ( ( ( ( is ( the ( compound H2O ) ) ) , ) ( ( meaning ( two ( hydrogen atoms ) ) ) ( combined ( with ( one ( oxygen ( atom forms ) ) ) ) ) ) ) ( ( one molecule ) ( of water ) ) ) . ) ) ) ) )
(ROOT (S (NP (NNP Water)) (, ,) (PP (IN for) (NP (NN example))) (, ,) (VP (VBZ is) (NP (DT the) (JJ compound) (NN H2O)) (, ,) (S (VP (VBG meaning) (NP (CD two) (NN hydrogen) (NNS atoms)) (PP (VBN combined) (PP (IN with) (NP (CD one) (NN oxygen) (NN atom) (NNS forms))))))) (NP (NP (CD one) (NN molecule)) (PP (IN of) (NP (NN water)))) (. .)))
Water, for example, is the compound H2O, meaning two hydrogen atoms combined with one oxygen atom forms one molecule of water.
(ROOT (S (NP (NP (CD 2) (NN hydrogen)) (, ,) (NP (CD 1) (NN oxygen) (NNS atoms))) (VP (VBP combine) (S (VP (TO to) (VP (VB make) (PRT (RP up)) (NP (NP (DT a) (NN molecule)) (PP (IN of) (NP (NN water)))))))) (. .)))
2 hydrogen, 1 oxygen atoms combine to make up a molecule of water.