Complex sentence: Bert and Ernie are two Muppet puppet characters on the popular U.S. children's television show "Sesame Street" that appear together in numerous skits, forming a comic duo that is one of the centerpieces of the program.
Split into simpler sentences: Bert and Ernie are two puppets on the popular U.S. children's television show "Sesame Street". Bert & Earnie appear together in numerous skits, forming a comic duo that is one of the centerpieces of the program.