Complex sentence: Making his debut in May 2004, he was one of only two Estonians ever to join the sport in Japan, and the first to reach the top division, which he achieved after just two years in sumo in May 2006.
Split into simpler sentences: Making his debut in May 2004, he was one of only two Estonians ever to join the sport in Japan. He reached the top division after just two years in sumo in May 2006.