Complex sentence: The Ultra-Lettrists continued to cause disruptions when they announced the death of cinema and showed their new hypergraphical techniques; the most notorious example is Guy Debord's "Howlings in favor of de Sade" ("Hurlements en Faveur de Sade") from 1952.
Split into simpler sentences: The Ultra-Lettrists continued to cause disruptions when they announced the death of cinema and showed their new hypergraphical techniques. The most notorious film of which is Guy Debord's "Howlings in favor of de Sade" ("Hurlements en Faveur de Sade") from 1952.