tasya medhatithis tasmat
putro ’bhut sumate rebhir
dusmantas tat-suto matah
tasya—of him (Kanva); medhatithih—a son named Medhatithi; tasmat—from him (Medhatithi); praskanna-adyah—sons headed by Praskanna; dvijatayah—all brahmanas; putrah—a son; abhut—there was; sumateh—from Sumati; rebhih—Rebhi; dusmantah—Maharaja Dusmanta; tat-sutah—the son of Rebhi; matah—is well-known.
The son of Kanva was Medhatithi, whose sons, all brahmanas, were headed by Praskanna. The son of Rantinava named Sumati had a son named Rebhi. Maharaja Dusmanta is well known as the son of Rebhi.
Link to this page: https://prabhupadabooks.com/sb/9/20/7