Complex sentence: Sometime during his reign, Cotys I married a Greek noblewoman called Eunice, through whom had a son called Tiberius Julius Rhescuporis I. Cotys I named his son after Rhescuporis II, a Thracian prince and king, who was a paternal uncle of his maternal grandfather.
Split into simpler sentences: Sometime during his reign, Cotys married a Greek noblewoman called Eunice, through whom had a son called Tiberius Julius Rhescuporis. Cotys named his son after Rhescuporis II, a Thracian prince and king, who was a paternal uncle of his maternal grandfather.