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

VOA: special.2009.12.22

U.S.officials have acknowledged early on that bringing the Israelis and Palestinians back to negotiations will be a long and complex process.

VOA: standard.2009.10.31

But the spokesman, Geoff Morrell,indicated that at this week's meetings Secretary Gates will tell the new Japanese leaders the United States expects the complex agreement to be honored.

VOA: standard.2009.10.18