Complex sentence: Henry Robinson Luce (April 3,1898--February 28,1967) was an American publisher, who launched and closely supervised a stable of magazines that transformed journalism and the reading habits of upscale Americans.
Split into simpler sentences: Henry Robinson Luce (April 3,1898--February 28,1967) was an influential American publisher. He launched and closely supervised a stable of magazines that transformed journalism and the reading habits of upscale Americans.