Complex sentence: Sam J. Miller is an award-winning science fiction, fantasy and horror short fiction author whose stories have appeared in publications such as Clarkesworld, Asimov's Science Fiction, and Lightspeed, along with over fifteen "year's best" story collections.
Split into simpler sentences: Sam J. Miller is a science fiction, fantasy and horror short fiction author. His stories have appeared in publications such as Clarkesworld, Asimov's Science Fiction, and Lightspeed, along with over fifteen "year's best" story collections.