Complex sentence: He continued to dominate sumo in 2005, becoming the first wrestler ever to win all six "honbasho" (sumo tournaments) in the same year and losing only six bouts all year (0-1-0-2-2-1).
Split into simpler sentences: He continued to dominate sumo in 2005, becoming the first wrestler ever to win all six "honbasho" (sumo tournaments) in the same year. Asashōryū lost only six bouts all year (0-1-0-2-2-1).