Complex sentence: Mr. Burns goes to an appointment with his psychiatrist to deal with his anger issues, however, much to Mr. Burns' anger, Dr. Nussbaum gives up on his case after seventy years and says that he will never be able to have a family.
Split into simpler sentences: Mr. Burns goes to an appointment with his psychiatrist to deal with his anger issues. Much to Mr. Burns' anger, Dr. Nussbaum gives up on his case after seventy years and says that he will never be able to have a family.