Complex sentence: He was a son of Duke Wolfgang of Zweibrücken, who when he died in 1569, bequeathed the Palatine share of the Rear County of Sponheim to his son Karl.
Split into simpler sentences: He was a son of Duke Wolfgang of Zweibrücken. As this in 1569 died, he bequeated the Palatine share on the Rear County of Sponheim to his son Karl.