Complex sentence: Carl Sandburg (January 6,1878--July 22,1967) was an American poet, writer, and editor who won three Pulitzer Prizes: two for his poetry and one for his biography of Abraham Lincoln.
Split into simpler sentences: Carl Sandburg (January 6,1878--July 22,1967) was an American poet, writer, and editor. He won three Pulitzer Prizes: two for his poetry and one for his biography of Abraham Lincoln.