From, equivalent to compound

(cur | prev) 14:34, 5 November 2016 CodeCat (talk | contribs) . . (330 bytes) (-55) . . (undo | thank)

You used this exact form for several other Brythonic entries. From (Proto-Celtic compound word), equivalent to (proto-brythonic) + (proto-brythonic). What's wrong with it?

The problem is that it isn't a compound word. A compound word consists of two independent words that are combined, but that isn't the case here.