Complex sentence: Jane M. Fearnley-Whittingstall ("née" Lascelles) (born 1939 in Kensington, London) is a writer and garden designer with a diploma in landscape architecture.
Split into simpler sentences: Jane M. Fearnley-Whittingstall ("née" Lascelles) was born in Kensington, London, in 1939. She is a writer and garden designer with a diploma in landscape architecture.