Complex sentence: The Marienbrücke, finished in 1852, enabled the connection of the railway tracks in the old town (Altstädt); the tracks running from the Silesian and Leipzig stations joined in front of the bridgehead.
Split into simpler sentences: The Marienbrücke, finished in 1852, enabled the connection of the railway tracks in the old town (Altstädt). The tracks running from the Silesian and Leipzig stations joined in front of the bridgehead.