Complex sentence: His first major role came in 1935 when he appeared as the title role in "Sexton Blake and the Bearded Doctor" and again in "Sexton Blake and the Mademoiselle" (1935) and "Sexton Blake and the Hooded Terror" (1938).
Split into simpler sentences: His first major role came in 1935 when he appeared as the title role in "Sexton Blake and the Bearded Doctor". He reprised this role in "Sexton Blake and the Mademoiselle" (1935) and "Sexton Blake and the Hooded Terror" (1938).