Complex sentence: The Peruzzi bank was taken over by outsiders in 1331 because there was but one partnership, based in Florence and held largely by Peruzzi family members, which owned everything-the employees were only paid a salary for their service.
Split into simpler sentences: The Peruzzi bank was taken over by outsiders in 1331 because there was but one partnership, based in Florence and held largely by Peruzzi family members, which owned everything. The employees were only paid a salary for their service.