Original sentence: But in cold weather the water vapor, which is a large part of the steam-gas mixture, condenses soon after it leaves the nozzle, and then a cloud of water fog enwraps the pilot.Specifically, for this reason the very first tethered flights of the Bell Rocket Belt were carried out in a hangar — the reason was winter.The rocket pack is a very noisy flight vehicle
Edited sentence: But in cold weather the water vapor, which is a large part of the steam-gas mixture, condenses soon after it leaves the nozzle, and then a cloud of water fog enwraps the pilot (for this reason, the very first tethered flights of the Bell Rocket Belt were carried out in a hangar)