Original sentence: It derives from the ancient Greek name for Iran, Persis.Persia has long been used by the West to describe the nation of Iran, its people, or its ancient empire.The Persian Empire is the name used to refer to a number of historic dynasties that have ruled the country of Persia (Iran)
Edited sentence: It derives from the ancient Greek name  Persis.Persia has long been used by the West to describe its people, or its ancient empire.The Persian Empire is the name used to refer to a number of historic dynasties that have ruled the area known as Persia