When I'm faced with a body of writing, even with paragraph breaks my eyes get boggled or my mind starts to wander around. I've gotten in the habit of highlighting comfy chunks of text & then I read within the highlighted area. It's almost like using ruler with a book.
If I wanna scroll up or down, say to check the author, the highlight remains & I can find my place again.
If I find that my mind has wandered, I can find a safe place to go back to or if it has really wandered, I can go open another window & read something else for awhile. After I drop the window that I've switched over to for a bit, my highlighted area is still highlighted for me, so I can pick up where I left off.
I do the same with long text online, highlight a bit and read it, highlight more. The only problem is on brietbart somehow it links through when I highlight a chunk of text, but everywhere else it works fine.
It is much easier, however, if I can get the poster to do it for me. :-)