The creation of a national highway system in the 1950s further fostered the development of mass retailing by opening vast new spaces in suburban malls.
( ( ( The creation ) ( of ( ( a ( national ( highway system ) ) ) ( in ( the 1950s ) ) ) ) ) ( further ( ( ( fostered ( ( the development ) ( of ( mass retailing ) ) ) ) ( by ( ( opening ( vast ( new spaces ) ) ) ( in ( suburban malls ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN creation)) (PP (IN of) (NP (NP (DT a) (JJ national) (NN highway) (NN system)) (PP (IN in) (NP (DT the) (NNS 1950s)))))) (ADVP (RB further)) (VP (VBD fostered) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (JJ mass) (NN retailing)))) (PP (IN by) (S (VP (VBG opening) (NP (JJ vast) (JJ new) (NNS spaces)) (PP (IN in) (NP (JJ suburban) (NNS malls))))))) (. .)))
Mass retailing grew to 20 times as it once was due to the creation of a national highway system in the 1950s.
( ( Mass retailing ) ( ( ( grew ( to ( 20 times ) ) ) ( as ( it ( once ( was ( due ( to ( ( the creation ) ( of ( ( a ( national ( highway system ) ) ) ( in ( the 1950s ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mass) (NN retailing)) (VP (VBD grew) (PP (TO to) (NP (QP (CD 20) (NNS times)))) (SBAR (IN as) (S (NP (PRP it)) (ADVP (RB once)) (VP (VBD was) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (NN creation)) (PP (IN of) (NP (NP (DT a) (JJ national) (NN highway) (NN system)) (PP (IN in) (NP (DT the) (NNS 1950s)))))))))))) (. .)))