Complex sentence: The last place on earth where any date exists is on Howland Island, in the IDLW time zone (the "Hawaii side" of the International Date Line), and so is the last spot on the globe for any day to exist.
Split into simpler sentences: The last place on earth where any date exists is on the the "Hawaii side" of the International Date Line. The time on Howland Island, in the IDLW time zone, is the last spot on the globe for any day to exist.