Thanks Irulan!
I did find Heuristic Processing and checked it, but wasn't quite sure where to go from there. I played around a bit with line wrapping, (unchecked "unwrap lines" plus checked it and changed the line unwrap factor a couple of times, because that seems to be the main problem with the formatting. But that didn't seem to make any difference when I viewed the book again. Do I have to do anything else to get changes to "take"?
I'm limping through it because I am determined to read the book, but it's not ideal.

