Simplify the following text for a Grade 10 native English-speaking person.
Original: In Survivor : Micronesia , it was theorized by Cirie Fields that the purple rock tiebreaker is the tiebreaker for all ties except in the final four when the fire-making challenge is used instead .
Simplified: In Survivor : Micronesia , it was suggested by Cirie Fields that the purple rock tiebreaker is the tiebreaker for all ties except in the Final Four , when a challenge is used instead .