Simplify the following text for a Grade 7 native English-speaking person.
Original: At the same time the small Special Projects part of the company , which since 2003 had been contracted to design and build Honda 's Indy Racing League engines , split away to become a separate company , owned by Mario Illien and Roger Penske .
Simplified: One division of the company was called Special Projects . Since 2003 , Special Projects had been building Honda 's Indy Racing League engines .