Simplify the following text for a Grade 11 native English-speaking person.
Original: This occurs when the body is exposed to constant temperatures of approximately 55 Â C , any prolonged exposure ( longer than a few hours ) at this temperature and up to around 70 Â C death is almost inevitable .
Simplified: This occurs when the body is exposed to temperatures of approximately 55 Â C ; any exposure longer than a few hours at this temperature or up to around 70 Â C kills .