Complex sentence: This ship is observed by alien Outsiders, who follow it in hopes of selling faster than light technology to the locals, which will lead to the advanced multi-species society portrayed in Neutron Star and Ringworld.
Split into simpler sentences: This ship is observed by alien Outsiders, who follow it in hopes of selling faster than light technology to the locals. This sale will lead to the advanced multi-species society portrayed in Neutron Star and Ringworld.