Simplify the following text for a Grade 12 native English-speaking person.
Original: Run since 1929 , it is widely considered to be one of the most important and prestigious automobile races in the world , alongside the Indianapolis 500 and the 24 Hours of Le Mans ( informally known as the Triple Crown of Motorsport ) .
Simplified: Run since 1929 , it is widely considered to be one of the most important and prestigious automobile races in the world alongside the Indianapolis 500 and the 24 Hours of Le Mans .