Complex sentence: Nestor class of robot appears in Asimov short story Little lost robot, and has a diminished first law, but it is Nestor 10, not 5 that is important in the story.
Split into simpler sentences: Nestor class of robot appears in Asimov short story Little lost robot. Nestor robots have a diminished first law, but it is Nestor 10, not 5 that is important in the story.