Complex sentence: At the German frontier at Neuschanz, the man goes to a buffet where Maigret switches his cheap suitcase with a substitute; in a hotel room in Bremen, the man kills himself when he finds his suitcase has been switched.
Split into simpler sentences: At the German frontier at Neuschanz, the man goes to a buffet where Maigret switches his cheap suitcase with a substitute. In a hotel room in Bremen, the man kills himself when he finds his suitcase has been switched.