Simplify the following text for a Grade 7 native English-speaking person.
Original: One reason for Mercedes parting ways with McLaren was `` because of McLaren 's ambitious plans to build road cars '' , as McLaren plan to put the McLaren MP4-12C in production by 2011 . However Mercedes said it would continue to supply engines to McLaren until 2015 .
Simplified: Mercedes also purchased a small portion of the McLaren .