Parse a Filename into Parts

I have a bunch of files with the name in a format such as:
How to_draw a Tiger - and many more -- Dr Doolittle -- a bunch of other things -- even more.epub

I want to parse out up until the second -- so that I end up with
How to_draw a Tiger - and many more -- Dr Doolittle.epub

The problem is I can't figure out how to pattern match. I cant use custom text like (sorry I kept getting a broken link picture when I tried to load the image but here is the link
https://drive.google.com/file/d/1Quf92pGONioZ4aMevrFAV17UfuQ2WFT9/view?usp=sharing
because the titles have special characters. I assume there is some way to do this with a script but I have no idea how to create such a script and I've searched and can't find something close that I could adapt. Thanks in advance for the help!

Note that the characters token does not match spaces. You can probably use "anything" there. Also, it might be better to put the -- outside the custom attribute, like you did for the one after part 2.