Complex sentence: According to the Augustan History and John Zonaras, Odaenathus was killed by his cousin whose name in the Augustan History is Maeonius, and claim that he was proclaimed emperor for a very brief period, before being trialed and executed by Odaenathus's wife Zenobia.
Split into simpler sentences: According to the Augustan History and John Zonaras, Odaenathus was killed by his cousin whose name in the Augustan History is Maeonius. The Augustan History also claim that Maeonius was proclaimed emperor for a very brief period, before being trialed and executed by Odaenathus's wife Zenobia.