Complex sentence: In this, the Arabs were aided by the prolonged period of internal instability that followed the first deposition of Justinian II in 695, in which the Byzantine throne changed hands seven times in violent revolutions.
Split into simpler sentences: In this, the Arabs were aided by the prolonged period of internal instability that followed the first deposition of Justinian II in 695. During this period, the Byzantine throne changed hands seven times in violent revolutions.