Complex sentence: The Clancy Brothers were an influential Irish folk music singing group, most popular in the 1960s, they were famed for their woolly Aran jumpers and are widely credited with popularizing Irish traditional music in the United States.
Split into simpler sentences: The Clancy Brothers were an influential Irish folk music singing group. Most popular in the 1960s, they were famed for their woolly Aran jumpers and are widely credited with popularizing Irish traditional music in the United States.