Complex sentence: A particularity of the station is that it was built over the ten railway lines as opposed to on their side, a large 90 by 78m platform was built over the line to carry the station building.
Split into simpler sentences: A particularity of the station is that it was built over the ten railway lines as opposed to next to them. A large 90 by 78 m platform was built over the line to support the station building.