Simplify the following text for a Grade 8 native English-speaking person.
Original: The Portuguese Grand Prix ( Grande PrÃ mio de Portugal ) was a motorsports event held for several years , mostly in the 1950s and then in the 1980s and 90s .
Simplified: The Portuguese Grand Prix ( Grande PrÃ mio de Portugal ) was a motor racing event held for several years , starting in the 1950s .