Take this post as an example Should there be a limit on the number of children one person can have? - Policy - Discussion forum - Pirate Party Australia
You can see he makes two smaller post in quick succession. Ideally the original author would edit the original post (But there is an edit window you are allowed to edit only in).
I think something like multiple post from the same author should be merged into one post automatically, if it is below a certain size. You can still deliminate with a line saying 4 hours later etc…
But it would reduce visual clutter this way.