Complex sentence: However, due to contractual obligations with "SNL", he was unable to participate, so actor-musician Murphy Dunne (whose father, George Dunne, was the Cook County Board President) was hired to take his role.
Split into simpler sentences: However, due to contractual obligations with "SNL", he was unable to participate. So actor-musician Murphy Dunne (whose father, George Dunne, was the Cook County Board President) was hired to take his role.