Complex sentence: Tauranga is one of New Zealand's fastest growing cities, with a 14 percent increase in population between the 2001 census and the 2006 census, though that number has slowed to 11% between the 2006 Census and the 2013 Census.
Split into simpler sentences: Tauranga is one of New Zealand's fastest growing cities, with a 14 percent increase in population between the 2001 census and the 2006 census. Though that number has slowed to 11% between the 2006 Census and the 2013 Census.