Complex sentence: In 356 he went to Alexandria with Eunomius in order to advocate Arianism, but he was banished by Constantius II. Julian recalled him from exile, bestowed upon him an estate in Lesbos, and retained him for a time at his court in Constantinople.
Split into simpler sentences: In 356 he went to Alexandria with Eunomius in order to advocate Arianism. Aëtius was afterwards banished from Alexandria by Constantius II. Julian recalled him from exile, bestowed upon him an estate in Lesbos, and retained him for a time at his court in Constantinople.