yatra siddhāḥ sva-pūrvajāḥ

te-these sons (the Savalasvas); ca-and; pitra-by their father; samadistah-being ordered; praja-sarge-in increasing progeny or population; dhrta-vratah-accepted vows; narayana-sarah-the holy lake named Narayana-saras; jagmuh-went to; yatra-where; siddhah-perfected; sva-purva-jah-their older brothers, who had previously gone there.