Simplify the following text for a Grade 8 native English-speaking person.
Original: Hermann Tilke ( born December 31 , 1954 in Olpe ) is a German engineer , designer of Formula One motor racing circuits and auto racer .
Simplified: Hermann Tilke ( born December 31 , 1954 in Olpe German ) is an architect and designer of Formula One motor racing circuits . He is also an auto racer .