Complex sentence: Lois Bancroft Long (December 15,1901-July 29,1974) was a popular American writer for The New Yorker during the 1920s who was both known under the pseudonym "Lipstick" and the epitome of a flapper.
Split into simpler sentences: Lois Bancroft Long (December 15,1901-July 29,1974) was a popular American writer for The New Yorker during the 1920s. She was known under the pseudonym "Lipstick" and as the epitome of a flapper.