Complex sentence: At the time each canton was responsible for its own postal service and there was no uniform postal rates for the entire country of Switzerland until after the establishment of a countrywide postal service on 1 January 1849.
Split into simpler sentences: At the time each canton was responsible for its own postal service. There were no uniform postal rates for the entire country of Switzerland until after the establishment of a countrywide postal service on 1 January 1849.