Complex sentence: By definition, the genre attempts to capture the dark atmosphere of many of the works of Gothic fiction, but incorporating elements of science fiction involving the setting of outer space and the concept of extraterrestrials.
Split into simpler sentences: By definition, the genre attempts to capture the dark atmosphere of gothic fiction while also incorporating elements of science fiction. Other works in the subgenre apply gothic conventions to the setting of outer space and the concept of extraterrestrials.