( ( Those ( taking Rosavin ) ) ( ( had ( ( a ( ( 56 % ) decrease ) ) ( in ( errors ( for ( four hours ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Those)) (VP (VBG taking) (NP (NNP Rosavin)))) (VP (VBD had) (NP (NP (DT a) (ADJP (CD 56) (NN %)) (NN decrease)) (PP (IN in) (NP (NP (NNS errors)) (PP (IN for) (NP (CD four) (NNS hours))))))) (. .)))
Those taking Rosavin had a 56% decrease in errors for four hours.
(ROOT (S (NP (PRP You)) (ADVP (NP (NP (NN decrease) (NNS errors)) (PP (IN in) (NP (DT an) (NN experiment)))) (IN by)) (VP (VBP take) (NP (JJ many) (NNS measurements))) (. .)))