General terms:
* Obfuscate: To make something unclear or difficult to understand.
* Obscure: To make something unclear or difficult to see or understand.
* Confuse: To make someone uncertain or unable to think clearly.
* Complicate: To make something more difficult to understand or deal with.
* Mystify: To bewilder or confuse someone.
More specific terms:
* Jargon: Specialized language that is difficult for outsiders to understand.
* Bureaucratese: Complex and often unnecessarily complicated language used in official documents.
* Doubletalk: Deliberately ambiguous or misleading language used to conceal the truth.
* Sophistry: The use of clever but fallacious arguments to deceive or mislead.
* Prolixity: Using more words than necessary, making something long and tedious.
The best word to use will depend on the context and the specific way in which the information is being made difficult to understand. For example, if you are talking about a government document that is written in a way that is difficult for the average person to comprehend, "bureaucratese" would be a good choice. If you are talking about someone who deliberately uses confusing language to avoid answering a question, "doubletalk" might be more appropriate.