original: Tarvos, or Saturn XXI, is a prograde irregular satellite of Saturn.
simplifications: Tarvos is a prograde irregular satellite of Saturn. Tarvos, or Saturn XXI, is a moon of Saturn. Tarvos is a satellite of Saturn. Tarvos is a prograde irregular satellite of Saturn. Tarvos, or Saturn XXI, is an irregular satellite of Saturn with a prograde orbit. Tarvos is known as Saturn XXI. It is a prograde irregular moon of Saturn. Tarvos is a satellite of Saturn. Tarvos is a prograde irregular satellite of Saturn. Tarvos or Saturn XXI is a prograde irregular satellite of Saturn. Tarvos, or Saturn XXI, is a prograde irregular satellite of Saturn.