Simplify the following text for a Grade 6 native English-speaking person.
Original: Ilmor already had a good name in F1 , and so the Sauber sportscar-team and Mercedes-Benz that were planning their Formula One entrance together signed a deal with Ilmor .
Simplified: Ilmor had developed a good name in F1 . When the Sauber sportscar-team and Mercedes-Benz were planning to enter Formula One together , they made a deal with Ilmor .