Complex sentence: Gary Hill's work is significant due to his successful combination of video, sculpture, audio, written and spoken text, evident in works such as "Incidence of Catastrophe" 1977-78.
Split into simpler sentences: Gary Hill's work successfully combines equally strong elements of video, sculpture, audio, spoken text, and written text. He is especially important because of his use of combinations of speech, image and text in works such as "Incidence of Catastrophe" 1977-78.