Simplify the following text for a Grade 7 native English-speaking person.
Original: `` Krusty Gets Busted '' is the twelfth episode of The Simpsons first season , and originally aired on April 29 , 1990 .
Simplified: `` Krusty Gets Busted '' is the twelfth episode of The Simpsons first season , and first started on April 29 , 1990 .