France expelled three high-ranking Cuban diplomats today in connection with the worldwide search for a man called Carlos.

in connection with 前面有 France 和 Cuban diplomats，谁和后面的在全世界寻找 Carlos 这件事有关？也就是说（这时的 search 是名词吧）到底是法国在寻找还是三个外交官在寻找？

   【答】in connection with 表示与该短语后面的事情有关。例如：

    Police want to talk to him in connection with his wife's disappearance. 警方想和他谈谈关于他妻子失踪的事。（摘自《麦克米伦高阶英汉双解词典》p.430）