Complex sentence: Prior to that date, absolute superiority of the parliament was adopted as a constitutional principle and there existed no legal institution to review the constitutionality of laws passed by the parliament, and of acts and actions of governments.
Split into simpler sentences: Prior to that date, absolute superiority of the parliament was adopted as a constitutional principle. There existed no legal institution to review the constitutionality of laws passed by the parliament, and of acts and actions of governments.