Complex sentence: The Alans and Georgians probably collaborated in the Christianization of the Vainakhs and Dvals in the 12th and 13th centurie, and the Alan contingents were frequently employed by the Georgian monarchs against their Muslim neighbors.
Split into simpler sentences: The Alans and Georgians probably collaborated in the Christianization of the Vainakhs and Dvals in the 12th and 13th centuries. Georgian Christian missionaries were active in Alania and the Alan contingents were frequently employed by the Georgian monarchs against their Muslim neighbors.