Complex sentence: Atsuko has retired from thew band to marry and has moved to Los Angeles; however, there is speculation that she may tour again, with Shonen Knife, on it's next North American tour.
Split into simpler sentences: Atsuko has retired from the band'to marry, and has moved to Los Angeles. However, there is speculation that she may tour again, with Shonen Knife, on it's next North American tour.