The puppeteers train for many years to move as one in bringing the puppet to life to act in complex theater productions.

VOA: special.2009.09.23

Doctor Carson is also known for performing other complex operations on children, including one called a hemispherectomy.

VOA: special.2009.09.04

The surgery can sometimes be complex, and may require more than one operation to correct.

VOA: special.2009.12.22

One red and gold carpet from the seventeenth century has complex patterns and animal designs.

VOA: special.2009.11.04

Steve Squyres says one of the most complex projects involves landing on Mars.

VOA: special.2010.05.25

More than 1,000 pages long, START-1 is one of the most complex treaties in history, dealing with reducing nuclear weapons.

VOA: standard.2009.04.08

In 2007, after a fire destroyed an apartment complex housing dozens of immigrant families, only one family accepted help from MCC.

VOA: standard.2010.07.22

The START-One agreement is one of the most complex treaties in history dealing with reducing nuclear weapons.

VOA: standard.2009.12.07

He called Iran "one of the most complex national security problems" the United States has faced in his more than 40 years in government.

VOA: standard.2009.12.12