In plain words
From the crown of the head to the soles of the feet, inside and out, up to its last covering of skin, this body is inert. Understand: I am the Self that is other than it, awareness itself, whole and deathless, standing firm by itself.
Word for word
Understand: I am the Self abiding of itself, complete and deathless awareness, distinct from this insentient body extending from crown to soles, within and without, bounded by its covering of skin.