Complex sentence: The newest guitarist to play with the group, and also replacing Siberil in Pennou Skoulm, Nicolas Quemener is also a member of the Fest Noz group Skeduz.
Split into simpler sentences: The newest guitarist to play with the group, and also replacing Siberil in Pennou Skoulm, is Nicolas Quemener. He is also a member of the Fest Noz group Skeduz.