Complex sentence: Rafferty was influential in helping Ireland's traditional music organization Comhaltas Ceoltóirí Éireann (CCE) establish itself in North America through the Martin Mulvihill Branch; since then, a branch has been named after him, the Michael Rafferty Branch, both in New Jersey.
Split into simpler sentences: Rafferty was influential in helping Ireland's traditional music organization Comhaltas Ceoltoiri Eireann (CCE) establish itself in North America through the Martin Mulvihill Branch. Since then, a branch has been named after him, the Michael Rafferty Branch both in New Jersey.