Complex sentence: Because of this The Book of the Damned was nominated in 1989 for a Locus Award in the category of Best Collection and placed 15th of 25 but has not been nominated for any other awards since then.
Split into simpler sentences: Because of this, "The Book of the Damned" was nominated in 1989 for a Locus Award in the category of Best Collection, and placed 15th of 25. It has not been nominated for any other awards since then.