Complex sentence: Anoka, population 6, Gross, population 2, and Monowi, population 1, which was the only incorporated city in the United States with only one resident at the 2010 census.
Split into simpler sentences: Anoka, population 6, Gross, population 2, and Monowi, population 1. Monowi was the only incorporated city in the United States with only one resident at the 2010 census.