Complex sentence: Iotapa had borne Mithridates a son, Antiochus III of Commagene and a daughter, Iotapa, who married King Sampsiceramus II of Emesa (modern Homs, Syria).
Split into simpler sentences: Iotapa had borne Mithridates a son, Antiochus III of Commagene and a daughter, Iotapa. They also had another daughter called Iotapa, who married King Sampsiceramus II of Emesa (modern Homs, Syria).