sumahātmana: of the exceedingly magnanimous, asya rājña: this king's, aśvamēdhē mahāyajñē Aswamedha sacrifice, dvijarṣabhā: best among brahmins, ṛṣyaśṛṅgam Rsyasringa, puraskṛtya led by, karma cakru: performed the rituals.
The best of brahmins led by Rsyasringa performed the rituals of aswamedha organised by the exceedingly magnanimous king.