Simplify the following text for a Grade 9 native English-speaking person.
Original: The team continued to use Sauber 's facilities , mostly for chassis construction and wind tunnel testing , while BMW 's headquarters in Munich were responsible for building the new P86 V8 engine .
Simplified: The team continued to use Sauber 's facilities , mostly for chassis construction and wind tunnel testing . BMW 's headquarters in Munich was responsible for building the new P86 V8 engine .