One thing I learned is that these kinds of events are extremely complex, and can be difficult to judge from the outside.

The painting was extremely complex and involved a great deal of hard work.

They can be extremely complex or very simple in their construction.

Her books are extremely complex and we tend to love them the most after the third read.

These models, at the most advanced level, become extremely complex and beautiful.

The climate is an extremely complex system, more so than the weather.

The ability to learn and understand language is an extremely complex process.

And there is something also extremely complex about its hearing.

The investigation is extremely complex in both economic and legal terms.

The subject of reform in the Arab world is an extremely complex one.