Simplify the following text for a Grade 6 native English-speaking person.
Original: Cintas , a wealthy collector of art and manuscripts , purchased the Bliss Copy at a public auction in 1949 for $ 54,000 ( $ as of ) , at that time the highest price ever paid for a document at public auction .
Simplified: Cintas liked to collect art and manuscripts . He had bought the Bliss Copy for $ 54,000 at a public auction in 1949 .