Complex sentence: The rings of Neptune, discovered in 1989 by the "Voyager 2" spacecraft, are tenuous, faint and dusty, and thus resemble the rings of Jupiter more than those of Saturn or Uranus.
Split into simpler sentences: The rings of Neptune, discovered in 1989 by the "Voyager 2" spacecraft, are tenuous, faint and dusty. They resemble the rings of Jupiter more than those of Saturn or Uranus.