First I am not an expert on this, but what I’d do is load it into one of the family history programs on your computer, if you don’t have one you can still get PAF for free. If you don’t already have one.
Here is the link: https://www.familysearch.org/products
Then split your family tree by extracting two gedcom files.
in PAF you do this by going to file >export > and at the bottom is an option to export all or partial export, use this to split the file.
An obvious split would be to do a gedcom of your mothers side and then another from you fathers side.
Hope this helps