Complex sentence: Marut, whose date and place of birth are unknown, performed on stage in Essen, Suhl, Crimmitschau, Berlin, Danzig and Düsseldorf before the First World War; from time to time, he also directed plays and wrote articles on theatre subjects.
Split into simpler sentences: Marut, whose date and place of birth are unknown, performed on stage in Essen, Suhl, Crimmitschau, Berlin, Danzig and Düsseldorf before the First World War. From time to time, he also directed plays and wrote articles on theatre subjects.