evamuktvā tato rājanmahāyogeśvaro hariḥ |darśayāmāsa pārthāya paramaṃ rūpamaiśvaram ||
Having said this, O king, Hari, the great lord of yoga, then revealed to the son of Pritha his supreme, sovereign form.
Explanation
Sanjaya is describing the scene to King Dhritarashtra. Having just granted Arjuna divine sight, Krishna, called Hari and the great lord of yoga (mahāyogeśvara), meaning master of divine power, now shows him his supreme, sovereign form. The description of that form continues in the next verse.