Complex sentence: In this last appearance of Humprey and Ranger J. Woodlore tourists have left the park leaving trash everywhere so the lazy ranger gets the bears to help him, but then the bears discover his trick and dump their bags of garbage on the ground.
Split into simpler sentences: In this last appearance of Humprey and Ranger J. Woodlore, tourists have left the park, leaving trash everywhere. The lazy ranger gets the bears to help him, but when the bears discover his trick, they dump their bags of garbage on the ground.