Complex sentence: Mr. Krab's excuse for the crime is that it's free day at the Bikini Bottom Zoo, getting peanuts thrown at him, to see how he likes it.
Split into simpler sentences: Mr. Krab's excuse for the crime is that it's free day at the Bikini Bottom Zoo. To be punished for his crime, Mr Krabs has peanuts thrown at him, to see how he likes it.