original: Prometheus acts as a shepherd satellite for the inner edge of Saturn's F Ring.
simplifications: Prometheus is the lead satellite for the inner edge of Saturn's F Ring. Prometheus acts like a small moon near the inside of Saturn's F Ring Prometheus acts as a moon that shapes Saturn's F Ring. Prometheus acts as a shepherd satellite. It herds the inner edge of Saturn's F Ring. Prometheus is a shepherd satellite for the inner edge of Saturn's F Ring. Prometheus acts as a shepherd moon for the inner edge of Saturn's F Ring. Prometheus serves as a shepherd satellite for the edge of Saturn's F Ring. Prometheus leads other satellites around the inside of Saturn's Ring. Prometheus becomes a herding satellite for the inner edge of Saturn's F Ring. Prometheus acts as a shepherd satellite for the inner edge of Saturn's F Ring.