Their complex nature can cause problems with using and managing results.

Some would argue that such a view does not take into account the complex nature of the human mind.

The answer lies partly in the complex nature of the disease.

It did not seem enough to explain our complex nature.

And now, for the first time in her life, she was facing a complex nature.

The problem in treating them is the complex nature of the brain.

"The biggest problem we have is the complex nature of the piece," he added.

But there was another curious side to his complex nature.

First, she says that the method was simple to understand, despite the complex nature of the research involved.

It was magic of the most complex and subtle nature.