Simplify the following text for a Grade 3 native English-speaking person.
Original: The Cave of Hearths in South Africa has burned deposits dated from 200,000 to 700,000 BP , as do various other sites such as Montagu Cave ( 58,000 to 200,000 BP ) and at the Klasies River Mouth ( 120,000 to 130,000 BP ) .
Simplified: The Cave of Hearths in South Africa has burned deposits dated from 0.2 to 0.7 Ma BP , as do many other places such as Montagu Cave ( 0.058 to 0.2 Ma BP ) and at the Klasies River Mouth ( 0.12 to 0.13 Ma BP ) .