Complex sentence: William Hillman (13 November 1848--4 February 1921) was a British bicycle and automobile manufacturer, founder in 1907 with Louis Coatalen of the Hillman-Coatalen Company, later the Hillman Motor Company after Coatalen's defection to Sunbeam in 1909.
Split into simpler sentences: William Hillman (13 November 1848--4 February 1921) was a British bicycle and automobile manufacturer. In partnership with Louis Coatalen he founded the Hillman-Coatalen Company in 1907, later the Hillman Motor Company after Coatalen's defection to Sunbeam in 1909.