Complex sentence: After being unmasked Carrera abandoned the Ultraman 2000 ring persona completely and started working exclusively as Damién 666, the change meant that he had to vacate the Mexican Welterweight title.
Split into simpler sentences: After being unmasked, Carrera abandoned the Ultraman 2000 ring persona completely and started working exclusively as Damién 666. This change meant that he had to vacate the Mexican Welterweight title.