Complex sentence: The other survivor, Cadet Cecil Guthrie (ex Royal Air Force), escaped, badly wounded from the ambush site but he asked for help at a house where two IRA men were staying and they killed him with his own gun.
Split into simpler sentences: The other survivor, Cadet Cecil Guthrie (ex Royal Air Force), was badly wounded but escaped to a nearby house where he asked for help. However, two IRA volunteers were staying there and they killed him with his own gun.