"It is our mission to ensure high academic achievement for every student by attracting and preparing outstanding leaders and supporting the performance of the urban public schools they lead at scale."
This mission statement got off to a shaky start, but then lost it at completely with that last word, "scale." What does that mean? It is a term that is used by nonprofit insiders to mean growth or growing. A layperson is probably stopped cold by it. The lesson: don't use your profession's jargon.
XYZ ensures high academic achievement for every student by attracting and preparing outstanding educational leaders and supporting the urban public schools that they lead.