Original sentence: The Parthians were a group of Iranian peoples ruling most of Greater Iran that is in modern-day Iran, western Iraq, Armenia and the Caucasus.The Sasanians succeeded the Parthians in 224-226 and were recognised as one of the leading world powers alongside its neighbouring arch-rival the Roman-Byzantine Empire for a period of more than 400 years.The eastern borders changed many times, as the Roman Empire was facing two major powers, The Parthian Empire and the Sasanian Empire
Edited sentence: Hadrian returned to the status quo ante, and surrendered the territories of Armenia, Mesopotamia, and Adiabene to their previous rulers and client-kings and didn't attempt to romanize the Parthian Empire.In 118 Hadrian decided that it was in Rome's interest to re-establish the Euphrates as the limit of its direct control.The Parthians were a group of Iranian peoples can ruled most of Greater Iran that is in modern-day Iran, western Iraq, Armenia and the Caucasus.The eastern borders changed many times, of which the longest lasting was the Euphrates river, eventually to be left behind as the Romans defeated their rivals, the Parthians, with the march on their capital, Susa in 115