Complex sentence: The writers, who had not produced any material, toured the city and were confronted in a hotel room by Jean Aberbach, who locked them into their hotel room by blocking the hotel room door with a sofa until they wrote the material.
Split into simpler sentences: The writers, who had not produced any material, toured the city. They were confronted in a hotel room by Jean Aberbach, who locked them in by blocking the hotel room door with a sofa, until they wrote the material.