Complex sentence: The name change became official when the "Canadian Museum of History Act" received Royal Assent on December 12,2013, with changes to the museum's visual identity implemented gradually over the course of the following months.
Split into simpler sentences: The name change became official when the "Canadian Museum of History Act" received Royal Assent on December 12,2013. Changes to the museum's visual identity were implemented gradually over the course of the following months.