Simplify the following text for a Grade 7 native English-speaking person.
Original: Over the years , there have been rebadged versions of the Corolla , sold by General Motors , including the 1980s ' Holden Nova of Australia , and the Sprinter-based Chevrolet Nova , Chevrolet Prizm , and Geo Prizm ( in the United States ) .
Simplified: The Corolla was once sold by Chevrolet in the United States as the Nova and Geo Prizm in the 1980s and 1990s .