Complex sentence: Soon after his arrival, a tumult occurred, in which the traitor Dexippus was rather roughly handled, and Cleander, instigated by him, threatened to sail away, to denounce the army as enemies, and to issue orders that no Greek city should receive them.
Split into simpler sentences: Soon after his arrival, a tumult occurred, in which the traitor Dexippus was roughly handled. At Dexippus' instigation, Cleander threatened to sail away, to denounce the army as enemies, and to issue orders that no Greek city should receive them.