Complex sentence: As part of the Santa Fe's rail network, it was part of what has come to be known as the Surf Line; as of January 2006, this line is the second busiest passenger rail line in the United States.
Split into simpler sentences: As part of the Santa Fe's rail network, it was part of what has come to be known as the Surf Line. As of January 2006, this line is the second busiest passenger rail line in the United States.