Complex sentence: Ajax was sent by Theodoric II, king of the Visigoths at Toulouse, to convert the Suevi to Arianism: the barbarian Arians showed a markedly greater missionary fervour than the Catholics in the fifth century.
Split into simpler sentences: Ajax was sent by Theodoric II, king of the Visigoths at Toulouse, to convert the Suevi to Arianism. The barbarian Arians showed a markedly greater missionary fervour than the Catholics in the fifth century.