Complex sentence: PASO members were so impressed by the organization of the Games on such short notice, they elected the President of the Mexican Olympic Committee, Mario Vázquez Raña, as the next PASO President during their meeting in Mexico City.
Split into simpler sentences: PASO members were impressed by the organization of the Games on such short notice. So much so, that they elected the President of the Mexican Olympic Committee, Mario Vázquez Raña, as the next PASO President during their meeting in Mexico City.