( It ( ( ( ( took ( ( ( many years ) and ) ( many measurements ) ) ) ( to map ) ) ( out ( the ( Milky ( Way galaxy ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD took) (NP (NP (JJ many) (NNS years)) (CC and) (NP (JJ many) (NNS measurements))) (PP (TO to) (NP (NN map))) (PP (IN out) (NP (DT the) (NNP Milky) (NNP Way) (NN galaxy)))) (. .)))
It took many years and many measurements to map out the Milky Way galaxy.
(ROOT (FRAG (S (S (VP (TO To) (VP (VB express) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (DT the) (JJ milky) (NN way) (NN galaxy)) (CC and) (NP (JJ other) (NNS galaxies)))))))) (, ,) (NP (NP (DT the) (ADJP (RBS most) (JJ appropriate)) (NN unit)) (PP (IN of) (NP (NN measurement)))) (VP (VBZ is) (NP (DT the) (NN light-year))))))