Original sentence: The Safavid Iran became one of the greatest Iranian empires since the Islamic conquest of Persia and established the Ithnāˤashari (Twelver) school of Shi'a Islam as the official religion of their empire, marking one of the most important turning points in the history of Islam
Edited sentence: They ruled one of the greatest Iranian empires since the Islamic conquest of Persia and established the Ithnāˤashari (Twelver) school of Shi'a Islam as the official religion of their empire, marking one of the most important turning points in the history of Islam