Complex sentence: Afterward they never recorded together or rarely appeared together for the next 14 years... embarking on a reunion tour in 1995 in support of their first duet album together in 15 years, "One".
Split into simpler sentences: Afterward they never recorded, or rarely appeared, together for the next 14 years. They embraked on a reunion tour in 1995 in support of their first duet album together in 15 years, "One".