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; the group was later formalized as Turkey City Writer's Workshop.
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. The group was later formalized as Turkey City Writer's Workshop.