Simplify the following text for a Grade 8 native English-speaking person.
Original: Vavrick-O ` Brien and Mariano were selected from this season to compete in Survivor : All-Stars , where they placed 8th and 2nd , respectively .
Simplified: Vavrick-O ` Brien and Mariano were chosen from this season to return in Survivor : All-Stars , where they placed 8th and 2nd .