Complex sentence: Lillian Nordica (December 12 1857--May 10 1914), American opera singer is generally considered to have been America's greatest dramatic soprano of the late 19th and early 20th centuries.
Split into simpler sentences: Lillian Nordica (December 12 1857--May 10 1914), was a leading American opera singer. She is generally considered to have been America's greatest dramatic soprano of the late 19th and early 20th centuries.