Complex sentence: Margaret Maddocks, née Margaret Kathleen Avern (10 August 1906--1993), was a British awarded writer of 17 gothic and romance novels from 1944 to 1975, before retiring she wrote her autobiography: "An Unlessoned Girl" in 1977.
Split into simpler sentences: Margaret Maddocks, née Margaret Kathleen Avern (10 August 1906--1993), was a British writer of 17 gothic and romance novels. Before retiring she wrote her autobiography: "An Unlessoned Girl" in 1977.