Complex sentence: The "comitia" were viewed as decedent for reasons beyond the fact that they were composed of the rabble of Rome, ignorant of the merits of the important questions that were laid before them.
Split into simpler sentences: The "comitia" were decedent for reasons beyond the fact that they were composed of the rabble of Rome. The electors in each of the "comitia" were ignorant as to the merits of the important questions that were laid before them.