Original sentence: He has also been a sponsor of New Politics (magazine) and an advisor on documentary biographies of Howard Zinn, comic artist Will Eisner, and Sacco and Vanzetti, and served as historian for the radio series Grandma was an Activist in the 1980s
Edited sentence: He has also been a sponsor of New Politics (magazine) and an advisor on documentary biographies of Howard Zinn, comic artist Will Eisner, and the labor martyrs Sacco and Vanzetti, and served as historian for the radio series Grandma was an Activist in the 1980s