Complex sentence: At the time, Yermo and Barstow were campaigning to establish a state park at Calico, Excerpted from the "Barstow Printer-Review" which was an active silver mining town from the early 1880s until the turn of the 20th century.
Split into simpler sentences: At the time, Yermo and Barstow were campaigning to establish a state park at Calico. Calico was an active silver mining town from the early 1880s until the turn of the 20th century.