śāntena śamayan rucā

dasa-varsa-ten years; sahasra-ante-at the end of a thousand; purusah-the Supreme Person; tu-then; sanatanah-eternal; tesam-of the Pracetas; avirabhut-appeared; krcchram-the severe austerity; santena-satisfying; samayan-mitigating; ruca-by His beauty.