Complex sentence: Mr. Burns buys all of the puppies from the Simpsons and successfully raises all of them into world-class championship racing dogs, winning him millions, to Homer's dismay over the Simpson's missed fortune-making opportunity.
Split into simpler sentences: Mr. Burns buys all of the puppies from the Simpsons. But Mr. Burns successfully raises all of them into world-class championship racing dogs, winning him millions, to Homer's dismay over the Simpson's missed fortune-making opportunity.