The biggest thing is that you should only talk about how the trope is used. Set it up in a way to establish exactly how the tribulation came around and how the world has changed, and talk about nothing else. The problem with the Rick and Morty example is that it's more of a plot summary. I don't want to hear the plot of the show; I want to hear how the trope applies to the show.
If you really want to talk about the trope in detail, do so after we've launched it, on the page for the work. People on the work's page are probably familiar with it, and thus can follow along. People like me on the trope's page most likely are not familiar with the work in question. Thus, we only want to hear about the basic details.
Take our example for The Sandman:
During A Game of You, it's revealed that Barbie's dreams feature this. As Princess Barbara, she is the rightful ruler of a realm where the Cuckoo has taken her throne, and introduces chaos through the power of compulsion. Armies march through peaceful villages and terrify the citizens, anthropomorphized creatures that can talk or perform magic. Barbie notes that while the Land is still beautiful, it is no longer home and won't be unless she defeats the Cuckoo. Martin Tenbones tells her that the Porpentine, a magical sugar gem, is what keeps the Land intact so she must never let the Cuckoo destroy it. Barbie fails; the Cuckoo slaughters most of her friends, brainwashes the rest, and compels her to destroy the Porpentine. Dream comes and ends the Land's time in the Dreaming, so all the dead inhabitants enter the palm of his hand. Even worse, when Dream appears, he breaks it gently to Barbie that Cuckoos are supposed to invite this level of destruction. Their nature is to grow in a dream world that isn't there, leave by any means possible, and fly to their hearts' content. He says that if Rose hadn't inadvertently interfered with Barbie's dream, the Cuckoo would be able to leave sooner.
Everything I've highlighted in italics are what I believe to be "plot summary" elements, where we don't talk about how the trope applies to the work. Instead, they talk about the consequences of the trope and what is happening in the dream land. The key thing is that I can follow along with the first part. The second part gets confusing because it dives into the plot of the work.
For a simplified version to go on this page, I'll write:
In A Game of You, Barbie's dreams. The Cuckoo has taken her throne, and introduced chaos through the power of compulsion. Armies change the world by marching through villages and terrifying the citizens. Barbie believes the Land is no longer home unless she defeats the Cuckoo, making this change permanent.
Don't be afraid to clearly signpost how each part of the plot relates to the trope. It's alright to say stuff like The storm of chaos is or thus changing the world forever. This only helps readers understand the example, in case they "zone out" while reading, and forget to absorb or think about the information. I know this, because I did that several times during the grammar pass!
You might want to consult another member of All The Tropes before making any changes to see how they would handle it. Everything here is just my opinion on how I would personally shorten examples. Good luck!
Alternatively, don't even bother with the check. If all other tropers vote that yes, this is launchable, then they clearly don't have a problem. I might be in the minority here. We or another person can always fix this after it's launched.
TL;DR: Only talk about how the work relates to the trope and nothing else.
