In "Wait, they really didn't already have that?" news, Google's publishing platform, Blogger, now supports jump breaks
in posts. Users have been splitting their posts by hand for a while now, so no one can blame you if you thought it was already a supported feature. Besides, you've seen this before on practically every other blogging platform - heck, I remember LiveJournal having jump breaks 10 years ago - so it's good to see Blogger catching up with the times.
You can add a jump break in the visual editor using a new toolbar button, or you can add it manually in the HTML editor by inserting " <!-- more -->
" where you want to divide your post. If you've got a heavily customized template, you may have slightly more work to do, but there are instructions
to help you out.