Complex sentence: The earliest known bishop is Aëtius, a friend of Arius and in December 415, the Council of Diospolis was held here to try Pelagius; he was acquitted.
Split into simpler sentences: The earliest known bishop is Aëtius, a friend of Arius. In December 415, the Council of Diospolis was held in the Bishopric to try Pelagius; he was acquitted.