Complex sentence: With this work of engineering began the golden age of Pacasmayo which lasted until 1967, the year when the railway stopped running; since this date the commercail activity decreased to the point where now the dock just as the railway station are historic monuments.
Split into simpler sentences: With this work of engineering began the golden age of Pacasmayo which lasted until 1967, the year when the railway stopped running. Since that time, the commercial activity has decreased to the point where now the dock, just as the railway station, are historic monuments.