Complex sentence: The building is currently used by the credit institution Sparkasse Freiburg-Nördlicher Breisgau and it is part of a complex which in the past was made up of 17 separate buildings.
Split into simpler sentences: The building is currently used by the Sparkasse Freiburg-Nördlicher Breisgau bank. It took part of a complex which, in the past, was made up of 17 separate buildings.