Complex sentence: The building could accommodate up to 8,000 people and Café Vaterland was the largest in the world; the one millionth guest was recorded in October 1929, barely a year after the opening.
Split into simpler sentences: The building could accommodate up to 8,000 people and Café Vaterland was the largest in the world. The one millionth guest was recorded in October 1929, barely a year after the opening.