Complex sentence: Catalonian institutions were abolished just a year after the Treaty was signed, and a royal French decree on April 2,1700 (applied on May 1), forbade Catalan language usage in any kind of official act.
Split into simpler sentences: Catalonian institutions were abolished just a year after the Treaty was signed. A royal French decree on April 2,1700 (applied on May 1), forbade Catalan language usage in any kind of official act.