Complex sentence: The intention of the court and jury system is that only the guilty should be convicted and that the innocent should always go free, however errors can be made (in both directions) and this is the reason for the Appeal system.
Split into simpler sentences: The intention of the court and jury system is that only the guilty should be convicted and that the innocent should always go free. However errors can be made (in both directions) and this is the reason for the appeal system.