Simplify the following text for a Grade 9 native English-speaking person.
Original: On March 12 , 2006 he debuted in Asistencia AsesorÃ a y AdministraciÃ n , a promotion based in Mexico as a character named Muerte Cibernetica and was involved in an angle where this character was `` killed . ''
Simplified: On March 12 , 2006 he started wrestling in Asistencia AsesorÃ a y AdministraciÃ n in Mexico as a character named Muerte Cibernetica .