Complex sentence: The combined population of the three downtown neighbourhoods was 12,455 in 2009; however, this figure does not include the 1,700 that live in Eau Claire, the 1,300 in Chinatown, and the 18,000 that live in the Beltline.
Split into simpler sentences: The combined population of the three downtown neighbourhoods was 12,455 in 2009. However, this figure does not include the 1,700 that live in Eau Claire, the 1,300 in Chinatown, and the 18,000 that live in the Beltline.