In plain words
The poet, to those who seek him: If you would search for that wondrous infant who, by his will, drew in his ancient form to lie in the midst of the far-spread waters, come, I shall tell you a sign: there are those who saw him in very truth, when for Piṉṉai, the modest daughter of the cowherd [Kumbha], he fought all seven fierce bulls till they died, and stood there sweating.