Complex sentence: Today, Amtrak, the national passenger rail system, provides service to Creston, operating its "California Zephyr" daily in both directions between Chicago, Illinois, and Emeryville, California, across the bay from San Francisco.
Split into simpler sentences: Today, Amtrak, the national passenger rail system, provides service to Creston. It operates its "California Zephyr" daily in both directions between Chicago, Illinois, and Emeryville, California, across the bay from San Francisco.