Complex sentence: The Alexanderplatz, the centre of Berlin's nightlife at this time, was part of the territory of Wessels's SA troop, and in September 1929 he met an 18-year-old prostitute, Erna Jänicke, in an Alexanderplatz bar.
Split into simpler sentences: The Alexanderplatz, the centre of Berlin's nightlife at this time, was part of the territory of Wessels's SA troop. In September 1929 he met an 18-year-old prostitute, Erna Jänicke, in an Alexanderplatz bar.