In plain words
The poet, to those who seek him: You who are searching in earnest for the God who swallowed the earth, the mountains, the tossing seas and whatever else there is, all of it, and surely brought it up again: there are those who saw him when he became a matchless boar, beyond all thought, plunged into the flood, prised the great earth free [from the wall of the universe], and wed the lady Earth with her lovely dark hair.