Complex sentence: They traveled from Montreal to New York City on the Star of the West to Panama, then overland by rail, then by the "Golden Age" to San Francisco, then by the "Northern" to Fort Vancouver.
Split into simpler sentences: They traveled from Montreal to New York City on the Star of the West to Panama. They proceeded overland by rail, on the "Golden Age" to San Francisco, then embarked on the "Northern" to Fort Vancouver.