Complex sentence: The vast majority of the Munros tested are unrelated to the chief's line and have a different Y-DNA halo group, R1B which is the most common Y-DNA group in Scotland, Ireland and the rest of the United Kingdom.
Split into simpler sentences: The vast majority of the Munros tested are unrelated to the chief's line and have a different Y-DNA halo group, R1B. R1B is the most common Y-DNA group in Scotland, Ireland and the rest of the United Kingdom.