Complex sentence: As a photographer for the Union Pacific Railroad, Savage traveled to California in 1866 and then followed the rails back to Promontory Summit, at Promontory, Utah where the Union Pacific and Central Pacific met in 1869.
Split into simpler sentences: As a photographer for the Union Pacific Railroad, Savage traveled to California in 1866 and then followed the rails back to Utah. He photographed the linking of the Union Pacific and Central Pacific on Promontory Summit, at Promontory, Utah in 1869.