Simplify the following text for a Grade 8 native English-speaking person.
Original: The feud resumed on October 1 when Orton , who earlier appeared `` via satellite from Chicago '' , attacked Cena after his match with Mr. Kennedy , knocking him out with an RKO on the announce table . However , during the match , Cena was legitimately injured , suffering a complete tear of his right pectoral tendon .
Simplified: On the October 1 episode of Raw , Cena legitimately tore his right pectoral muscle during a match with Mr. Kennedy and attack by Orton .