Meanwhile, back at the ranch

Here's some solid advice I got a year and a half ago about plot and structure: banish the words "and then" and replace them with "but", "therefore", and "meanwhile."

But is the idea of conflict and opposition. The good guy wants something but the bad guy stands in the way.

Therefore there must be an escalation of action and tension. The good guy does something to get around the bad guy but he hits a roadblock he must overcome.

Meanwhile suggests a parallel narrative, two plots happening in tandem. When one story hits a climactic peak, you cut away ("Meanwhile, back at the Ranch...") to the other.

Editor Tony Zhou explains in this video and if you still don't get it, have a look at this post on Vox.