Complex sentence: Certainly, Galicia is nowadays a strong player on the international Celtic folk scene; and as a result, elements of the pre-industrial Galician tradition have become integrated into the modern Celtic folk repertoire and style.
Split into simpler sentences: Certainly, Galicia is nowadays a strong player on the international "Celtic folk" scene. As a result, elements of the pre-industrial Galician tradition have become integrated into the modern "Celtic folk" repertoire and style.