Complex sentence: Uriangato city is geographically united to Moroleon city and Yuriria city, these three cities be a metropolitan area since October 2010, this metropolitan area is 75th biggest city of Mexico and the 5th biggest in Guanajuato, is smallest of the 56 metropolitan areas in Mexico.
Split into simpler sentences: Uriangato city is geographically united to Moroleon city and Yuriria city, these three cities are a metropolitan area. Since October 2010, this metropolitan area is 75th biggest city of Mexico and the 5th biggest in Guanajuato, is smallest of the 56 metropolitan areas in Mexico.