Complex sentence: "It Girl" was originally slang for a beautiful, stylish young woman who possesses sex appeal without flaunting her sexuality, when the phrase originated as in British upper class society around the turn of the 20th century.
Split into simpler sentences: It Girl is slang for a beautiful, stylish young woman who possesses sex appeal without flaunting her sexuality. The phrase is believed to have originated as in British upper class society around the turn of the 20th century.