Simplify the following text for a Grade 8 native English-speaking person.
Original: A race track ( or ` racetrack ' , ` racing track ' or ` racing circuit ' ) is a purpose-built facility for racing of animals ( e.g. horse racing or greyhound racing ) , automobiles , motorcycles or athletes .
Simplified: Examples of animal racing are horse racing . Examples of vehicle racing are automobiles and motorcycles .