Complex sentence: Newman corners Sheridan inside one of the patient's rooms where he witnesses Royce holding Sheridan gunpoint, but then Royce shoots Newman, revealing himself as the mole inside the U.S. State Department he also lies to the team that it was Sheridan that ambushed and shot Newman.
Split into simpler sentences: Newman corners Sheridan inside one of the patient's rooms where he witnesses Royce holding Sheridan at gunpoint. But then Royce shoots Newman, revealing himself as the mole inside the U.S. State Department and later lies to the team claiming Sheridan ambushed and shot Newman.