Mr. Hinton learned to play the most difficult and complex classical exercises.

Global investing is here to stay, experts say, but it is becoming an increasingly complex exercise.

Such is the wealth of information that analysis could easily become a complex statistical exercise.

Assassinations had been a rare but real alternative to more complex exercises of diplomatic muscle.

Working out the different points is going to be a very complex and difficult exercise.

A complex exercise aims to have as few boundaries as possible.

The solution to the problem was one of the soap's most complex and creative exercises, that required intricate planning.

That would make it a game, a complex exercise in ingenuity and daring.

But the opportunities to arrange and carry out such a complex exercise are rare, even for the wine makers: time is short, responsibilities long.

But courting black voters is a much more complex and nuanced exercise than any of the campaigns suggest.