Complex sentence: It is named after Dame Nellie Melba, the stage name for Australian opera singer Helen Porter Mitchell, and is thought to date back to 1897, a year when the singer was very ill and this kind of toast became a staple of her diet.
Split into simpler sentences: It is named after Dame Nellie Melba, the stage name of Australian opera singer Helen Porter Mitchell. The term is thought to date back to 1897, a year when the singer was very ill and this kind of toast became a staple of her diet.