Complex sentence: In 879 or 880, Emperor Basil I the Macedonian appointed Nasar as the commander of the Imperial Fleet, and sent him west to confront a raid by a fleet of 60 ships sent by the Aghlabid emirate of Ifriqiya against the western coasts of Greece.
Split into simpler sentences: In 879 or 880, Emperor Basil I the Macedonian appointed Nasar as the commander of the Imperial Fleet. Nasar's first task was to confront a raid by a fleet of 60 ships, sent by the Aghlabid emirate of Ifriqiya against the western coasts of Greece.