Complex sentence: After crushing Arabs in the south, he moved east to deal with eastern nomads, After a prolonged struggle (353-358) they were forced to conclude a peace, and their king, Grumbates, accompanied Shapur in the war against the Romans.
Split into simpler sentences: After crushing Arabs in the south, he moved east to deal with nomadic forces. Following a prolonged struggle from (353-358) they were forced to conclude a peace, and their king, Grumbates, accompanied Shapur in the war against the Romans.