Complex sentence: The Merry Band's exceptional musicianship aid in creating the style Williamson had desired in the past.the addition of the Celtic style would be a trademark of Williamson and The Merry Band on further works.
Split into simpler sentences: The Merry Band's exceptional musicianship aid in creating the style Williamson had desired in the past. The addition of the Celtic style would be a trademark of Williamson and The Merry Band on further works.