Complex sentence: Thomas Hill (September 11,1829-June 30,1908) was an important American artist of the 19th century and produced some of the finest paintings of the California and Yosemite Valley landscape.
Split into simpler sentences: Thomas Hill (September 11,1829-June 30,1908) was an important American artist of the 19th century. He produced some of the finest paintings of the California and Yosemite Valley landscape.