Simplify the following text for a Grade 8 native English-speaking person.
Original: Superstar Saga was followed by two sequels , Mario & Luigi : Partners in Time , which was released for the Nintendo DS in 2005 and Mario & Luigi : Bowser 's Inside Story , which was released in 2009 , also for the DS .
Simplified: The other two games starring both Mario and Luigi are Mario & Luigi : Partners in Time and Mario & Luigi : Bowser 's Inside Story .