Original sentence: The Sydenham River is a river in Kent County, Lambton County and Middlesex County in southwestern Ontario, Canada flowing southwest from its source west of London, Ontario and empties into Lake Saint Clair
Edited sentence: The Sydenham River is a river in Kent County, Lambton County and Middlesex County in southwestern Ontario, Canada, flowing southwest from its source west of London, Ontario and emptying into Lake Saint Clair