Complex sentence: As soon as the tour was announced, and in order to assure not over-priced and high ticket sells five cities were used as a "test", which led to a minimum of 7,000 tickets sold instantly per city.
Split into simpler sentences: As soon as the tour was announced and in order to assure not over-priced and high ticket sells five cities were used as a "test". The result was promising as a minimum of 7,000 tickets sold instantly per city.