Original sentence: He has continually published writing on Marxism for 25 years.He is a veteran of the Free Speech Movement and the Left of the 1960s and early 1970s, and was closely associated with the Black Panther Party
Edited sentence: By the mid-1970s, he emerged as the foremost Maoist revolutionary in the United States.He is a major leader of the international communist movement who has produced a highly significant body of work over the last 25 years and who claims that Marxism must be approached as a living, developing science constantly interrogating itself.He is a veteran of the Free Speech Movement and the revolutionary upsurges of the 1960s and early 1970s, and was closely associated with the Black Panther Party