In plain words
The poet, of the Lord: These [the places I have named] are the temples of the Lord who took the form of a lion [Narasiṃha] to tear apart the chest of Hiraṇya; who has for his bed the serpent whose eyes serve it for ears; who dwells within the four Vedas; who keeps in one part of his body the one who received the honey-sweet Gaṅgā [Śiva]; and who lies on the Sea of Milk.