Complex sentence: Beker argues that while Christianity has modified its doctrine on the displacement of the Jews, Islam's inability to reverse or reform its theology on the succession of both the Jews and the Christians presents a major barrier to conflict resolution in the Arab-Israeli conflict.
Split into simpler sentences: Beker argues that while Christianity has modified its doctrine on the displacement of the Jews, he accuses Islam of not reversing or reforming its theology on the succession of both the Jews and the Christians. According to Baker, this presents a major barrier to conflict resolution in the Arab-Israeli conflict.