Complex sentence: The idea that campaigns--not institutions--were the best weapon against corruption predominated under Deng, and is best seen in the establishment of the Central Party Rectification Steering Committee during the 1980s.
Split into simpler sentences: The idea that campaigns, and not institutions, were the best weapon against corruption dominated under Deng. This is best seen with the establishment of the Central Party Rectification Steering Committee in the 1980s.