Complex sentence: He opened his San Francisco studio in February 1850, taking on Rulofson as a partner in 1860, and the firm of Bradley & Rulofson was recognized as the leading photographic establishment on the West Coast, winning first prize at the Centennial Exposition at Philadelphia in 1876.
Split into simpler sentences: He opened his San Francisco studio in February 1850, taking on Rulofson as a partner in 1860. The firm of Bradley & Rulofson was recognized as the leading photographic establishment on the West Coast, winning first prize at the Centennial Exposition at Philadelphia in 1876.