Complex sentence: In 1940 Henry Faber is a German spy, called'die Nadel' ('The Needle') for the use of a stiletto as his trademark weapon, working at a London railway depot, collecting information on troop movements.
Split into simpler sentences: In 1940 Henry Faber is the alias used by a German spy, nicknamed'die Nadel' ('The Needle') due to his preference for the use of a stiletto as his trademark weapon. He is working at a London railway depot, collecting information on troop movements.