Complex sentence: The American Federation of Labor (AFL) was a national federation of labor unions in the United States founded in Columbus, Ohio, in December 1886 by an alliance of craft unions disaffected from the Knights of Labor, a national labor association.
Split into simpler sentences: The American Federation of Labor (AFL) was a national federation of labor unions in the United States. It was founded in Columbus, Ohio, in December 1886 by an alliance of craft unions disaffected from the Knights of Labor, a national labor association.