Complex sentence: Buddy puts a small playing stool on the stunned villain's back and spins the top part that the stool's midsection extends from the Musician's back to the ceiling, thus trapping him on the floor.
Split into simpler sentences: Buddy puts a small playing stool on the stunned villain's back and spins the top part. The stool's midsection extends from the Musician's back to the ceiling, thus trapping him on the floor.