Complex sentence: The original story introduced the framing story character, Leahtrah and Thorin, who were members of warring cat nations loosely modeled as the equivalent of the Arab-Israeli conflict in the Middle East.
Split into simpler sentences: The original story introduced the framing story characters, Leahtrah and Thorin. They were members of warring cat nations; loosely modeled as the equivalent of the Arab-Israeli conflict in the Middle East.