The first one is the correct sequence of events, because he had sat down - the action was complete, but I find the usage of "than" instead of "before" or "when" troubling, and past progressive after past perfect is quite confusing temporally. Maybe: Barely had the Fifa president Sepp Blatter sat down after delivering a keynote address to the congress of the world governing body, when a critical email from the European Clubs Association hit the inboxes of journalists in the hall.
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Anonymous"Barely had the Fifa president Sepp Blatter sat down after delivering a keynote address to the world governing body's congress than a critical email from the European Clubs Association was already hitting the inboxes of journalists in the hall." [The Independent.]1. Blatter delivered the ad
What is chronological order of actions in the sentence?