Complex sentence: Though "Miss" is less commonly used as a title by unmarried adult women in the United States than in the past, some still prefer to benty-first century etiquette honors an adult woman's personal preference of title.
Split into simpler sentences: Though "Miss" is less commonly used as a title by unmarried adult women in the United States than in the past, some still prefer to be referred to as such. Twenty-first century etiquette honors an adult woman's personal preference of title.