Complex sentence: Chrestus was of Greek Macedonian and Persian ancestry; the second son born to the Pontian monarchs Mithridates V of Pontus and Laodice VI.
Split into simpler sentences: Chrestus was of Greek Macedonian and Persian ancestry. He was the second son and among the children born to the Pontian monarchs Mithridates V of Pontus and Laodice VI.