Complex sentence: Up until 4 May 1950 the northern section was called Kronprinzenstrasse and the southern section Viktoriastrasse; then it was renamed after the Russian poet Vladimir Mayakovski.
Split into simpler sentences: Up until 4 May 1950 the northern section was called Kronprinzenstrasse and the southern section Viktoriastrasse. It was then renamed after the Russian poet Vladimir Mayakovski.