Complex sentence: That same year, she sold her first romance novel and with her ensuing success in the genre, speculative writing was allowed to slide, though elements of it appear periodically in some of her romances and novellas.
Split into simpler sentences: That same year, she sold her first romance novel. With her ensuing success in the latter genre, she allowed speculative writing to slide, though elements of it appear periodically in some of her romances and novellas.