主句是The WTO is a useful forum,其余是状语,定语等,可省略.
to recognise these costs and commit funds to redressing them、 to ensure that the aid itself is not just a political instrument和to be withdrawn是并列成分,进一步说明forum.
if the country dose something that the donor country dose not like.是条件句.句子意思是:WTO是一个论坛,在论坛里,将会认识到这些成本,并承诺纠正他们的资金,以确保援助本身不只是一个政治工具,如果该国剂量捐助国不喜欢的东西,这个论坛被撤回.