Complex sentence: Abiathar ben Elijah ha-Cohen (c.1040-1109), was the last Palestinian Gaon who succeeded his father Rabbi Elijah to the gaonate in 1083.
Split into simpler sentences: Abiathar ben Elijah ha-Cohen (c.1040-1109), was the last Palestinian Gaon. He succeeded his father Rabbi Elijah to the gaonate in 1083.