Simplify the following text for a Grade 9 native English-speaking person.
Original: Anthony Michael `` Tony '' Lazzeri ( December 6 , 1903 â '' August 6 , 1946 ) was an American Major League Baseball player during the 1920s and 1930s , predominantly with the New York Yankees .
Simplified: Anthony Michael Lazzeri ( December 6 , 1903 â '' August 6 , 1946 ) was a Major League Baseball player , mostly for the New York Yankees .