Complex sentence: Having designed for theatre wardrobe at university, he worked as a dress designer for the House of Reville for three years beginning in 1929 until he opened his own fashion house at 22 Bruton Street, just off Berkeley Square in 1932.
Split into simpler sentences: Having designed for theatre wardrobe at university, he worked as a dress designer for the House of Reville for three years beginning in 1929. In 1932, Steibel opened his own fashion house at 22 Bruton Street, just off Berkeley Square in 1932.