If you go to the
Space Empires Galaxies web site, you can see some long history entries. Go to the Aldan Galaxy site. Click on Empires. View the Zhentara and Soban Dominion pages (the Soban has the longest I have ever seen
). That info fits in the empire file fine.
If your text is longer, just copy it into a new empire file, then save it. Remove it from the list. Readd the empire file (this will ensure that it is reading from whatever was saved in the actual .emp file). Start the game. See if your text shows up.