Complex sentence: For the first North American leg of the tour as well as the United Kingdom dates of the European leg, each city had a local band open for Bon Jovi; the band had decided this for a chance to promote local talent.
Split into simpler sentences: For the first North American leg of the tour as well as the UK dates of the European tour, each city had a local band open for Bon Jovi. The band had decided this for a chance to promote local talent.