Complex sentence: On April 25,2004 at Pride Total Elimination 2004, the first round of the 2004 Heavyweight Grand Prix, he faced the unbeaten professional wrestler and former judoka Hirotaka Yokoi, whom he submitted with the debut of his "anaconda choke".
Split into simpler sentences: On April 25,2004, at Pride Total Elimination 2004, the first round of the 2004 Heavyweight Grand Prix was held. Nogueira faced the unbeaten professional wrestler and former judoka Hirotaka Yokoi, whom he submitted with the debut of his "anaconda choke".