Complex sentence: The Lancastrian regime was founded and legitimised by formal lying that was both official and in public which has been described as "a series of unconstitutional actions and upon three major acts of perjury".
Split into simpler sentences: The Lancastrian regime was founded and legitimised by formal lying that was both public and official. This has been described as "a series of unconstitutional actions" based "upon three major acts of perjury".