Complex sentence: Chris Jericho would lose the WWF Undisputed Championship at WrestleMania X8, but would get revenge a month later when he cost Triple H the championship at Backlash 2002.
Split into simpler sentences: Chris Jericho would lose the WWF Undisputed Championship at WrestleMania X8. The feud with Triple H continued, and Jericho would get revenge a month later when he cost Triple H the championship at Backlash 2002.