Complex sentence: Instead of challenging Randy Orton for the title at WrestleMania, he chose to face him at No Way Out, where Orton got himself intentionally disqualified by slapping the referee, retaining the WWE Title due to WWE regulations.
Split into simpler sentences: Instead of challenging Randy Orton for the title at WrestleMania, he chose to challenge him at No Way Out. In the match, Orton got himself intentionally disqualified by slapping the referee, retaining the WWE Title due to WWE regulations.