I can't think of the word and it's been bothering me for some time now. I have attempted to reverse search it, to no avail. If someone could oblige me with the word whose definition means to oversimplify an often complex issue, I would most appreciate it!
To gloss something means to provide a brief explanation of an obscure word of expression, and the word is commonly extended to ideas as as well. Of course, a brief explanation of a complex subject can't help but oversimplify it, otherwise it wouldn't be brief.