Complex sentence: The last scene shifts to the now rebuilt NSA Headquarters, where we see Gibbons, Steele and Shavers discussing what the next xXx agent should be; farther off the grid, a fresh face, a new model.
Split into simpler sentences: The last scene shifts to the now rebuilt NSA Headquarters. Were it's shows Gibbons, Steele, and Shavers explaining on what the next xXx agent should be, having them farther off the grid, fresh face, and new model.