Complex sentence: Israel wrote about the customs of the Huns, including the local cult of Tengri History of Alwank'(Caucasian Albania or Alwank' in Armenian) of Armenian Historian Movses Kalankatvatsi (Daskhurantsi) (VII-VIII cc).
Split into simpler sentences: Israel wrote about the customs of the Huns, including the local cult of Tengri. This infromation comes from History of Alwank'(Caucasian Albania or Alwank' in Armenian) of Armenian Historian Movses Kalankatvatsi (Daskhurantsi) (VII-VIII cc).