। ॥ ३५० ॥
In plain words
The intellect, together with the senses of perception, forms the vijnanamaya kosha—the intellectual sheath—because it is heavily imbued with consciousness and acts as a veil over the true Self.
Close to the Sanskrit
The intellectual sheath is the intellect along with the organs of perception, because of the abundance of intellect and because of the veiling of the Self.