Complex sentence: Swift will embark on the album's supporting tour, The 1989 World Tour which will kick off in Tokyo on May 5,2015, the tour will hit Asia, Europe and North America before heading to Oceania in December 2015.
Split into simpler sentences: Swift will embark on the album's supporting tour, The 1989 World Tour, on May 5,2015, in Tokyo. The tour will hit Asia, Europe and North America, before heading to Oceania in December 2015.