I'm happy to go more slowly.
It is as follows: “That the chair be empowered to schedule meetings with the witnesses listed in the request for today's meeting, as the chair deems appropriate, as per the availability of witnesses.”
As to the reasoning, Mr. Chair, I think it's self-explanatory. This allows for the best approach in terms of organizing future meetings. Leaving it in your hands and the hands of those who help organize meetings on the clerk's side, I think, would be quite useful.
Thanks a lot.