Complex sentence: Selma soon grows weary of caring for Bart and Lisa, especiaslly when they go on the Little Land of Duff ride and Bart dares Lisa to drink the toxic "water".
Split into simpler sentences: Selma soon grows weary of caring for Bart and Lisa. Things get worse when Selma, Bart, and Lisa are on the Little Land of Duff ride and Bart dares Lisa to drink the toxic "water".