Complex sentence: William Sylvester Harley (December 29,1880--September 18,1943) was an American mechanical engineer, entrepreneur and one of the co-founders of the Harley-Davidson Motor Company.
Split into simpler sentences: William Sylvester Harley (December 29,1880--September 18,1943) was an American mechanical engineer and businessman. He was one of the co-founders of the Harley-Davidson Motor Company.