Where an individual or group has been idnetified where explanations or discussions tend to drift, get lots in side-tracks, take much longer than should, or fail to reach solid conclusions.
Facilitator needs to discuss this with individual/team, and achieve a recognition that this behaviour is happening, and is detrimental to everyone.
Method is then introduced - when the individual or members of team have an issue to explain or discuss, they are to think about and then present the issue/situation using 10 words or less. This must capture the essence of the issue in a clear way, that is comprehensible to the listener. Of course many issues will be too complex and will require more information, so the listener may, then, if they desire, ask for more information, but the individual must not rely on this - they must get their thoughts sufficiently in place to get the essence clearly into those ten words.
That should be done initially in controlled environments, either in workshops or during regular meetings (one-to-one or team), while the participants get the hang of doing this, but after that the co-workers/boss can at any time request "Ten words", and the person must then summarise their current issue/etc in those ten words. After method is established some flexibility can be allowed - e.g. occasionally allowing an extra few words in the summary.