Going by what I remember from my elementary school English class, it wasn't run-on sentences
by definition that I had an issue with. I mean, I still connected thoughts together in the same sentence with what I believed was appropriate comma placement and the use of a connecting word like "and", "or", etc. But still, they were often just too long to read and grasp all at once, when I could have found a way to separate them into two or three smaller sentences. It especially didn't help that with RPGMaker 1, in-game you could only see three lines in the dialogue box at a time (each line being about forty alphanumeric characters), so if a sentence was longer than that ... well, for the reader that can easily get them lost after going to the next box.
A guy we knew and I had met a few times in person over the years from RPG Maker Magazine actually did a stream on our game on Twitch a few years ago, and he read every bit of dialogue out loud during the playthrough. And oftentimes throughout, he had to stop and collect his breath or take a drink. ... Not the worst sign of a man's writing skill, but certainly not the best either.