Complex sentence: Greenville (locally) is the seat of Greenville County in upstate South Carolina, United States with a population of 61,397 as of 2013, the sixth largest in the state.
Split into simpler sentences: Greenville (locally) is the seat of Greenville County in upstate South Carolina, United States. With a population of 61,397 as of 2013, it is the sixth largest municipality in the state.