( ( In ( ( each molecule ) ( of water ) ) ) ( , ( there ( ( are ( ( ( 2 ( hydrogen atoms ) ) and ) ( 1 ( oxygen atom ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT each) (NN molecule)) (PP (IN of) (NP (NN water))))) (, ,) (NP (EX there)) (VP (VBP are) (NP (NP (CD 2) (NN hydrogen) (NNS atoms)) (CC and) (NP (CD 1) (NN oxygen) (NN atom)))) (. .)))
In each molecule of water, there are 2 hydrogen atoms and 1 oxygen atom.
(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.