Complex sentence: James Raleigh "Biz" Mackey (July 27 1897-September 22 1965) was an American catcher and manager in Negro league baseball, who came to be regarded as black baseball's premier catcher in the late 1920s and early 1930s.
Split into simpler sentences: James Raleigh "Biz" Mackey (July 27,1897--September 22,1965) was an American catcher and manager in Negro league baseball. He came to be regarded as black baseball's premier catcher in the late 1920s and early 1930s.