Simplify the following text for a Grade 6 native English-speaking person.
Original: In April 1963 , the first race with Formula One cars took place at Imola , as a non-championship event , won by Jim Clark for Lotus .
Simplified: In April 1963 , the first race with Formula One cars took place at Imola . It was a non-championship event , and was won by Jim Clark for Lotus .