Complex sentence: Dochterman has twice been a guest of honor at the science, science fiction, and fantasy convention, CONvergence.Dochterman was recognized for his work by having shared a Video Premier Award for his supervision of visual effects in the movie'.
Split into simpler sentences: Dochterman has twice been a guest of honor at the science, science fiction, and fantasy convention, CONvergence. He shared a Video Premier Award for his supervision of visual effects in the movie'.