This statement是主语,
is given 是谓语
in the event是状语
后面是主语的 同位语从句
that
it may be of relevance 是从句中的主句 后面是省略if的虚拟条件句 要倒装
should
authorities of the country concerned是虚拟条件句的主语
be prepared to consider a waiver of production of the requested certificate.
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