Complex sentence: Master Sergeant MacDonald James "Mack" Gerhardt (United States Army, callsign: "Dirt Diver") (portrayed by Max Martini) is a former Army Ranger, paratrooper with the 101st Airborne and a senior Unit operator.
Split into simpler sentences: Master Sergeant MacDonald James "Mack" Gerhardt (United States Army, callsign: "Dirt Diver") He is portrayed by Max Martini. Mack is a former Army Ranger, paratrooper with the 101st Airborne and a senior Unit operator.