Complex sentence: The second one battled with Mew Pudding and charged toward her until it was hit in the head with a rock that fell from the ceiling and Tart lost control of it resulting in a cave-in that trapped Mew Pudding and Tart.
Split into simpler sentences: The second one battled with Mew Pudding and charged toward her until it was hit in the head with a rock that fell from the ceiling. This resulted in Tart losing control of it resulting in a cave-in that trapped Mew Pudding and Tart.