Complex sentence: Remaining undefeated for nearly a year, they eventually lost the titles to Jimmy Deo & L.A. Gore in Dover, New Hampshire on June 6, they regained the title that same night although they later vacated the titles after leaving the promotion the following year.
Split into simpler sentences: Remaining undefeated for nearly a year, they would very briefly loose the titles to Jimmy Deo & L.A. Gore in Dover, New Hampshire on June 6 however they would regain the titles that same night. They later vacated the titles after leaving the promotion the following year.