Currently, it is not visible to the user that multiple users had edited the page when the conflict appeared. This is especially bad, when someone trolled and it now looks like the last person did everything.
Show users when multiple edits have happened. This means:
For the left column:
Change the explanatory text as described in the comment below ([T162144#3193188]). Only, instead of writing "changed by X editors", please write: "changed x times" to account for one person editing multiple times.
For the right column (text editor):
Use the following text (which exludes the edit summary line)
Initially, the editor's content is the currently published version.
Add your changes to the text in the editor and click on "Publish changes".