Complex sentence: Bindoy, the uncle of Khosrau, who had accompanied him into exile, was sent with a 70,000 men Byzantine army granted by Byzantine Emperor Maurice, to Armenia to outflank Bahram, who was defeated in the lowlands and lost Ctesiphon.
Split into simpler sentences: Bindoy, the uncle of Khosrau, who had accompanied him into exile, was sent with a 70,000 man Byzantine army granted by the Byzantine Emperor Maurice. They went to Armenia to outflank Bahram, who was defeated in the lowlands and lost Ctesiphon.