Complex sentence: The following table includes sixteen volumes (one of them collecting western stories) where up to three stories (representing no more than half the book) were previously published in a Sturgeon collection.
Split into simpler sentences: The following table includes sixteen volumes (one of them collecting western stories). However, some volumes did contain a few reprinted stories: this list includes volumes wherein up to three stories (representing no more than half the book) were previously published in a Sturgeon collection.