Complex sentence: As of the 2010 census, the population was 919,628, which increased to 1,034,070 as of the 2015 estimate, making it both the most populated and densely populated county in North Carolina.
Split into simpler sentences: As of the 2010 census, the population was 919,628. It increased to 1,034,070 as of the 2015 estimate, making it both the most populated and most densely populated county in North Carolina.