Complex sentence: Francisco I. Madero, lost the 1910 presidential election, he 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, having lost the 1910 presidential election, revolted under the Plan of San Luis Potosí. This Plan declared the Díaz presidency illegitimate, named Madero as provisional president, called for democracy, and demanded the return of lands unjustly taken from Mexican villages.