Inquirer,
Father Ron Robeson's text - which is on-line at the CNEWA site - is likely the most easily accessible, best written, and least polemical piece on the various Eastern and Oriental Churches - Catholic and Orthodox. It can be found
here [cnewa.org]. It may or may not be as short as you'd like, but asking that a document provide information about "all/most of" the 22 Eastern Catholic Churches and be short may be a contradiction in terms.
As to the diagram to which you refer, I'd suggest you review it carefully or have someone intimately familiar with the Rites, Churches, and the relationships among them do so, unless you are absolutely positive of its accuracy. There are a few variations out there, including ones on both parish and eparchial sites, that are basically correct but contain inaccurate or obsolete terminology that will little serve and potentially confuse folks when they try to later relate it to other information.
Many years,
Neil