Simplify the following text for a Grade 9 native English-speaking person.
Original: Finally , the Olympic torch is brought into the stadium and passed on until it reaches the final torch carrierâ '' often a well-known and successful Olympic athlete from the host nationâ '' who lights the Olympic flame in the stadium 's cauldron .
Simplified: Following this the Olympic torch is brought into the stadium and passed on until it reaches the final torch carrier who lights the cauldren .