Complex sentence: Saturn's narrow F Ring has the small satellites Prometheus and Pandora orbiting just inside and outside it, and traditionally they have both been viewed as shepherds; however, recent studies indicate that only Prometheus contributes to the ring's confinement.
Split into simpler sentences: Saturn's narrow F Ring has the small satellites Prometheus and Pandora orbiting just inside and outside it, and traditionally they have both been viewed as shepherds. However, recent studies indicate that only Prometheus contributes to the ring's confinement.