Though the two cities remained unlinked by rail, this was about to change quickly.
( ( Though ( ( the ( two cities ) ) ( ( remained unlinked ) ( by rail ) ) ) ) ( , ( this ( ( was ( about ( to ( change quickly ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Though) (S (NP (DT the) (CD two) (NNS cities)) (VP (VBD remained) (ADJP (JJ unlinked)) (PP (IN by) (NP (NN rail)))))) (, ,) (NP (DT this)) (VP (VBD was) (VP (IN about) (S (VP (TO to) (VP (VB change) (ADVP (RB quickly))))))) (. .)))
The railway between the two cities was completed 2 years later.
( ( ( The railway ) ( between ( the ( two cities ) ) ) ) ( ( was ( completed ( ( 2 years ) later ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN railway)) (PP (IN between) (NP (DT the) (CD two) (NNS cities)))) (VP (VBD was) (VP (VBN completed) (ADVP (NP (CD 2) (NNS years)) (RB later)))) (. .)))