Complex sentence: In 1920, the administrative burden was considerably increased by the incorporation of several outlying towns and villages into the city of Berlin in the Greater Berlin Act; as a result, some departments and units had to be housed outside the building.
Split into simpler sentences: In 1920, the administrative burden was considerably increased by the incorporation of several outlying towns and villages into the city of Berlin in the Greater Berlin Act. As a result, some departments and units had to be housed outside the building.