Simplify the following text for a Grade 9 native English-speaking person.
Original: However , Mercedes stepped back from the project with the engines only carrying the slogan `` Concept by Mercedes-Benz '' and the engine was officially called Ilmor .
Simplified: However , Ilmor deceided not to put the slogan `` Concept by Mercedes-Benz '' on the engines . Since the engines were officially called Ilmor , Mercedes backed out of the project with Ilmor .