Complex sentence: By the time Badd Company wrestled its last match for ECW Tanaka and Diamond had already signed with World Championship Wrestling, Tanaka had even made his on-screen debut as "Tanaka-San".
Split into simpler sentences: By the time Badd Company wrestled its last match for ECW, Tanaka and Diamond had already signed with World Championship Wrestling. Tanaka then made his on-screen debut as "Tanaka-San".