Complex sentence: When Julian became sole emperor, he raised Salutius to praetorian prefect of the orient late in 361 and one of his early tasks was to oversee the Chalcedon tribunal.
Split into simpler sentences: When Julian became sole emperor, he raised Salutius to praetorian prefect of the Orient late in 361. One of Salutius' early tasks was to oversee the Chalcedon tribunal.