Complex sentence: During the 1970s, he joined a group of science fiction writers in Austin, Texas, which included Lisa Tuttle, Howard Waldrop and Bruce Sterling, and published his first science fiction story, "Flies by Night" (co-written with Tuttle), in 1975.
Split into simpler sentences: During the 1970s, he joined a group of science fiction writers in Austin, Texas, which included Lisa Tuttle, Howard Waldrop and Bruce Sterling. Utley published his first science fiction story, "Flies by Night" (co-written with Tuttle), in 1975.