Complex sentence: The building was the center of the cities social scene during the late 1940's the Rotarians, Kiwanis, and Lions Club met their every week with the day of the meeting on a rotating schedule.
Split into simpler sentences: The building was the center of the city's social scene during the late 1940's. The Rotarians, Kiwanis, and Lions Club met there every week with the day of the meeting on a rotating schedule.