Complex sentence: Rosemary Joyce Vercoe (29 April 1917--28 July 2013) was a British actress and costume designer, perhaps best known for being a long-term collaborator with Jonathan Miller on his opera and theatre productions.
Split into simpler sentences: Rosemary Joyce Vercoe (1917--2013) was a British actress and costume designer. Vercoe was a regular collaborator with Jonathan Miller on his opera and theatre productions.