Complex sentence: He is best known for the "Catalyst" style that is seen as direct, natural, and cinematically truthful, as no directorial voice-over or "voice" is heard among the voices of others.
Split into simpler sentences: He is best known for the so-called "Catalyst" style, seen as direct, natural, and cinematically truthful. No directorial voice-over or "voice" is heard among the voices of others.