Complex sentence: Most democratic countries (e.g. European countries) have representatives in their senates, parliaments, commissions... from several parties, ensuring a wider representation of different views, although it makes any negotiating process more complicated.
Split into simpler sentences: Most democratic countries (e.g. European countries) have representatives in their senates, parliaments, commissions... from several parties. This ensures a plurality of views, although it makes any negotiating process more complicated.