Complex sentence: Dame Vera Margaret Lynn (née Welch; born 20 March 1917), widely known as "the Forces' Sweetheart", is an English singer, songwriter and actress, whose musical recordings and performances were enormously popular during the Second World War.
Split into simpler sentences: Dame Vera Margaret Lynn (née Welch; born 20 March 1917), widely known as "the Forces' Sweetheart", is an English singer, songwriter and actress. Her musical recordings and performances were enormously popular during the Second World War.