Complex sentence: Tsing Ma Bridge and Kap Shui Mun Bridge in Hong Kong have six lanes on their upper decks and on their lower decks, there are two lanes and a pair of tracks for MTR metro trains.
Split into simpler sentences: Tsing Ma Bridge and Kap Shui Mun Bridge in Hong Kong have six lanes on the upper decks. On the lower decks there are two lanes and a pair of tracks for MTR metro trains.