Complex sentence: Steven F. Arnold (1943-1994), trendsetting American artist and protégé of Salvador Dalí, was a visionary filmmaker, photographer, painter, illustrator, set and costume designer, and assemblage artist.
Split into simpler sentences: Steven F. Arnold (1943-1994) was an American artist and protégé of Salvador Dalí. He was a filmmaker, photographer, painter, illustrator, set and costume designer, and assemblage artist.