Complex sentence: In the Pauline epistles (e.g.: "unto eternal life through Jesus Christ"), life becomes possible in the person of Jesus Christ, where by the grace of God and through faith in Christ humans can receive the gift of "eternal" life.
Split into simpler sentences: In the Pauline epistles (e.g.), life becomes possible in the person of Jesus Christ. And by the grace of God and through faith in Christ humans can receive the gift of "eternal" life.