Complex sentence: The Browns were an American country music singing group made up of Jim Ed Brown and his sisters, Maxine Brown and Bonnie Brown best known for their 1959 hit, "The Three Bells".
Split into simpler sentences: The Browns were an American family country music singing group made up of Jim Ed Brown and his sisters, Maxine Brown and Bonnie Brown. They are known primarily for their 1959 hit, "The Three Bells".