Complex sentence: Scar tries to escape by climbing to Pride Rock's summit but when he is checkmated by Simba next to the cliff, he attempts to blame the hyenas, but Simba no longer believes him.
Split into simpler sentences: Scar tries to escape by climbing to Pride Rock's summit. But he is checkmated by Simba next to a cliff, he attempts to blame the hyenas, but Simba no longer believes him.