Simplify the following text for a Grade 8 native English-speaking person.
Original: As indicated in the 1820 census records , Shelby County contained 2,492 people ; 2,044 whites and 448 Africans .
Simplified: The 1820 census records say that Shelby County contained 2,492 people at that time , 2,044 whites and 448 Africans .