Original sentence: He invited contention in the 1950s by his controversial testimony in the security clearance hearing of his former Los Alamos colleague Robert Oppenheimer, and thus became ostracized by much of the scientific community
Edited sentence: He achieved infamy in the 1950s due to his controversial testimony in the security clearance hearing of his former Los Alamos colleague Robert Oppenheimer, and as such became ostracized from much of the scientific community