Complex sentence: The first building was built on the corner of Sögestrasse and Pelzerstrasse by Rudolph Karstadt AG., established in 1881 by Rudolph Karstadt.
Split into simpler sentences: The first building was built at the corner of Sögestrasse and Pelzerstrasse. It was built by Rudolph Karstadt AG. which had been established in 1881 by Rudolph Karstadt.