Complex sentence: On impulse, Elin persuades Agnes to hitch to Stockholm (a five-hour journey); a car even stops and the driver agrees to take them, believing them to be sisters visiting their grandmother.
Split into simpler sentences: On impulse, Elin persuades Agnes to hitch to Stockholm, a five-hour car journey away. A car even stops and the driver agrees to take them, believing them to be sisters who were visiting their grandmother.