arjunaḥ - Arjuna; kṛtavīryasya - of Kṛtavīrya; sapta-dvīpa - of the seven islands (the whole world); īśvaraḥ abhavat - became the emperor; dattātreyāt - from Dattātreya; hareḥ amśāt - from he who was the incarnation of the Supreme Personality of Godhead; prāpta - obtained; yoga-mahāguṇaḥ - the quality of mystic power.

The son of Kṛtavīrya was Arjuna. He [Kārtavīryārjuna] became the emperor of the entire world, consisting of seven islands, and received mystic power from Dattātreya, the incarnation of the Supreme Personality of Godhead. Thus he obtained the mystic perfections known as aṣṭa-siddhi.