Complex sentence: Robert Whitney Waterman (December 15,1826 April 12,1891) was the 17th Governor of California from September 12,1887 until January 8,1891.
Split into simpler sentences: Robert Whitney Waterman (December 15,1826--April 12,1891) was an American politician. He served as the 17th Governor of California from September 12,1887 until January 8,1891.