Complex sentence: As this was Alastair Reynolds's first published hardback or hardcover fiction, and was published in a relatively small initial print run in the United Kingdom, it subsequently became one of the most collectible first editions of the decade.
Split into simpler sentences: As this was Alastair Reynolds's first published hardback or hardcover fiction. It has become one of the most, and was published in a relatively small initial print run in the United Kingdom, it subsequently became one of the most collectible first editions of the decade.