Complex sentence: The first persecution of Christians organised by the Roman government took place under the emperor Nero in 64 AD after the Great Fire of Rome; with the passage in 313 AD of the Edict of Milan, anti-Christian policies directed against Christians by the Roman government ceased.
Split into simpler sentences: The first persecution of Christians organised by the Roman government took place under the emperor Nero in 64 AD after the Great Fire of Rome. With the passage in 313 AD of the Edict of Milan, anti-Christian policies directed against Christians by the Roman government ceased.