( ( Each ( water molecule ) ) ( ( has ( ( ( ( two atoms ) ( of hydrogen ) ) and ) ( ( one atom ) ( of oxygen ) ) ) ) . ) )
(ROOT (S (NP (DT Each) (NN water) (NN molecule)) (VP (VBZ has) (NP (NP (NP (CD two) (NNS atoms)) (PP (IN of) (NP (NN hydrogen)))) (CC and) (NP (NP (CD one) (NN atom)) (PP (IN of) (NP (NN oxygen)))))) (. .)))
Each water molecule has two atoms of hydrogen and one atom of oxygen.
(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.