Complex sentence: During 2013 the UK boyband One Direction started to perform Teenage Dirtbag on their world tour, creating a new lifeline and influx of new generation fans for Wheatus, who have since made the promise of making all of their 2013 UK tour dates accessible for all ages.
Split into simpler sentences: During 2013 the UK boyband One Direction started to perform Teenage Dirtbag on their world tour, creating a new lifeline and influx of new generation fans for Wheatus. Who have since made the promise of making all of their 2013 UK tour dates accessible for all ages.