Complex sentence: Ricimer was of a royal lineage, an Arian Christian, the son of Rechila, Suevic King of Galicia; his mother was the sister or daughter of Wallia, king of the Visigoths.
Split into simpler sentences: Ricimer was of a royal lineage, an Arian Christian, the son of Rechila, the Suevic King of Galicia. His mother was the daughter of Wallia, king of the Visigoths.