I've always believed this.

Complexity is just a state of partial ignorance of detail.

Once a concept is fully understood it is no longer complex.

Unfortunately there are barriers to understanding:

Technical (our current technology is limited and cannot yet describe what is being considered past the theoretical).

Social (people don't want to understand concepts that are required for unravelling the complexity).

Physical (limitations in memory, language, or other restriction on intellectual capacity).

The above statements as an idea in itself could be considered complex as it conveys detail in a belief but it's tenets are quite simple and all three can be invoked:

Belief implies lack of technical understanding, social as people may be bored of this comment and finally some simply may not understand self referential material...