Complex sentence: Francisco I. Madero, cheated out of the 1910 presidential election, revolted under the Plan of San Luis Potosí which declared the Díaz presidency illegitimate, named Madero as provisional president, called for democracy, and demanded the return of lands unjustly taken from Mexican villages.
Split into simpler sentences: Francisco I. Madero, cheated out of the 1910 presidential election, revolted under the Plan of San Luis Potosí. It declared Díaz not the legitimate president, Madero as provisional president, called for democracy, and demanded for the return of lands unjustly taken from Mexican villages.