Complex sentence: He registered wins in the 1960s, 1970s, 1980s, 1990s and the 2000s, putting him in the company of Jack Johnson, who had wins in the 1890s, 1900s, 1910s, 1920s and 1930s.
Split into simpler sentences: He registered wins in the 1960s, 1970s, 1980s, 1990s and the 2000s. Putting him in the company of such boxers as Jack Johnson who had wins in the 1890s, 1900s, 1910s, 1920s and 1930s.