Complex sentence: Having settled the affair in Khorasan he resumed the invasion of Roman territories and later annihilated a Roman force of 60,000 at the Battle of Barbalissos and burned and ravaged the Roman province of Syria and all its dependencies.
Split into simpler sentences: Having settled the affair in Khorasan he resumed the invasion of Roman territories, and later annihilated a Roman force of 60,000 at the Battle of Barbalissos. He then burned and ravaged the Roman province of Syria and all its dependencies.