In plain words
That one alone is Brahma the four-faced, and Siva, and Vishnu. He is Indra, king of the gods, and Guha. He himself is the teacher of all the gods. He is the great yogi, and the one rich in every austerity.
Word for word
That one himself is Brahma, Shiva and Vishnu, Indra and Guha; he is the teacher of all gods, the great yogin and the possessor of all austerity's wealth.