This is a complex text and the procedure for review has also been complex.

Racism is a complex issue.

It is a highly complex problem.

Naturally, it is a complex business.

Nicotine addiction is a complex matter.

These are thus areas which require us to discuss the most intricate matters on a case by case basis.

It has been a very difficult task and, excuse the pun, a difficult road for him to travel down.

It is a difficult treaty that is difficult to understand.

This is a difficult debate.

These are difficult issues.

7425 He has a difficult task.

This is clearly problematic.

I feel this is especially problematic.

Here prosecution is often problematic.

The project has been long and problematic.

That is particularly problematic in matters of finances.

34591 This situation has proved highly problematical in practice.

Even if only a quarter of what he said is true, the situation is extremely problematical.

This is a very tricky business.

The question of age limits is extremely tricky.

He had a really very tricky subject to deal with.

A tricky situation has arisen within the industry in recent years.

They may have created tricky situations, individual problems that will have to be examined individually.