The phrase "concluded swiftly" is correct and can be used in written English.
It means to bring something to an end quickly or efficiently. Example: The meeting was concluded swiftly after the final decision was made. OR The negotiations were concluded swiftly, much to everyone's relief.
Negotiations must be concluded swiftly.
From then on our arguments were conducted efficiently and concluded swiftly (if loudly).
I hope that the investigation is concluded swiftly, so our customer can go out and buy a Mercedes or two.
Insiders say that the firm's trading floor is doing little business, and there is concern that clients could be lost unless a buyout is concluded swiftly.
The 24-year-old Belgium international will become the second most expensive player in Liverpool's history as soon as he agrees personal terms for the move to Merseyside, which is expected to be concluded swiftly.
BAGHDAD — Hopes that a security agreement between Iraq and the United States could be concluded swiftly receded Sunday as several of the leading Iraqi political parties, including some that had negotiated the agreement, appeared to back away from quick approval.
"The risks of not concluding swiftly the negotiations remain fully with Greece," it said.
The risks of not concluding swiftly the negotiations remain fully with Greece".
These are strange days at the capital's only paid-for paper, but the Standard sale did at least open up the Tatler job for Ostler, resulting in a job swap with her predecessor Geordie Greig - the Standard's new editor - that was concluded remarkably swiftly.
Historian Eugene Campbell Barker suggests that the discussions would likely not have concluded so swiftly unless the delegates had done "considerable preparation before the meeting".
An investigation involving very few people could be swiftly concluded".
