Complex sentence: G. Haine found, in the royal library at Simancas, Garcia's letters to Charles V written in the years 1530--32, of interest for the history of the Protestant Reformation as well as for the religious and political history of Spain during that period.
Split into simpler sentences: G. Haine found, in the royal library at Simancas, Garcia's letters to Charles V written in the years 1530--32. They contain information of importance for the history of the Protestant Reformation as well as for the religious and political history of Spain during that period.