Complex sentence: With respect to governmental information, any government may distinguish which materials are public or protected from disclosure to the public based on classification of information as sensitive, classified or secret and being otherwise protected from disclosure due to relevance of the information to protecting the national interest.
Split into simpler sentences: With respect to governmental information, any government may distinguish which materials are public or protected from disclosure to the public. State materials are protected due to either of two reasons: the classification of information as sensitive, classified or secret, or the relevance of the information to protecting the national interest.