For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit: Christ also hath once suffered - See the notes on Romans 5:6; Hebrews 9:28 (note).
Put to death in the flesh - In his human nature.
But quickened by the Spirit - That very dead body revived by the power of his Divinity. There are various opinions on the meaning of this verse, with which I need not trouble the reader, as I have produced that which is most likely.