( Water ( ( is ( ( a molecule ) ( that ( consists ( of ( ( ( one ( oxygen atom ) ) and ) ( two ( hydrogen atoms ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (NP (NP (DT a) (NN molecule)) (SBAR (WHNP (WDT that)) (S (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN oxygen) (NN atom)) (CC and) (NP (CD two) (NN hydrogen) (NNS atoms))))))))) (. .)))
Water is a molecule that consists of one oxygen atom and two hydrogen atoms.
(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.