Simplify the following text for a Grade 5 native English-speaking person.
Original: In 1980 , the Italian Grand Prix moved from the high-speed Monza circuit to Imola , as a direct result of 1978 's startline pile-up , which claimed the life of the popular Swedish driver Ronnie Peterson .
Simplified: In 1980 , the Italian Grand Prix moved from the high-speed Monza circuit to Imola . This was because of a bad crash in 1978 .