Complex sentence: Rome Metropolitan Statistical Area decreased in population from 299,397 in 2010 to 296,615 on July 1,2014 and its population density was 3,818.1 people per square mile (1,471.3/km²).
Split into simpler sentences: Rome Metropolitan Statistical Area decreased in population from 299,397 in 2010 to 296,615 as of July 1,2014. The population density was 3,818.1 people per square mile (1,471.3/km²).