Complex sentence: The protagonists of the series are mostly immortal cyborgs, specifically the botanist Mendoza, and the Facilitator Joseph, who were recruited as children to serve the Company in its ostensible mission to preserve artifacts from the past for a better future.
Split into simpler sentences: The protagonists of the series are mostly immortal cyborgs, specifically the botanist Mendoza, and the Facilitator Joseph. They were recruited as children to serve the Company in its ostensible mission to preserve artifacts from the past for a better future.