Complex sentence: While Benny Morris considers the real picture of the Arab aims to be more complex, notably because they were well aware they could not defeat the Jews, he argues that the Yishuv was indeed threatened with extinction and feared what would happen if the Arabs won.
Split into simpler sentences: While Benny Morris considers the real picture of the Arab aims to be more complex. He argues that they were well aware they could not defeat the Jews, and that the Yishuv was threatened with extinction and feared what would happen if the Arabs won.