How to fix conversion error line breaks in Microsoft Word?

Thanks for posting. See if the following works for you. I asked Copilot:

"Word" VBA regex find space followed by uppercase character and add return between space and character

and it gave my the following VBA:

Sub AddReturnBetweenSpaceAndUppercase()
    Dim regEx As Object
    Dim matches As Object
    Dim match As Object
    Dim docRange As Range
    
    ' Create RegExp object
    Set regEx = CreateObject("VBScript.RegExp")
    regEx.Pattern = " ([A-Z])"   ' Space followed by uppercase letter
    regEx.Global = True
    regEx.IgnoreCase = False     ' Case-sensitive (only uppercase)
    
    ' Work on the whole document
    Set docRange = ActiveDocument.Content
    
    ' Run regex replace: replace space+uppercase with paragraph mark + uppercase
    docRange.Text = regEx.Replace(docRange.Text, vbCr & "\1")
    
    MsgBox "Done! Paragraph breaks inserted.", vbInformation
End Sub

Here are the notes accompanying the code:

How It Works

Pattern:

• " ([A-Z])" → matches a space followed by an uppercase letter (A–Z).
  • The uppercase letter is captured in group 1 ([A-Z]).
  Replacement:

  - `vbCr & "\1"` → inserts a paragraph break (`vbCr`) before the captured uppercase letter.
  
  **Scope**:
  
     - `ActiveDocument.Content` → applies to the entire document.
  

Important Notes

• This replaces all matches in the document at once.
• If you want to preserve formatting, you should use Word’s Find with wildcards instead of replacing .Text directly (because .Text replacement removes formatting).

Formatting-Safe Alternative (Word Wildcards)

Vba

Sub AddReturnFormattingSafe()
    With Selection.Find
        .ClearFormatting
        .Replacement.ClearFormatting
        .Text = " ([A-Z])"
        .Replacement.Text = "^p\1"
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchWildcards = True
        .Execute Replace:=wdReplaceAll
    End With
    MsgBox "Done! Paragraph breaks inserted.", vbInformation
End Sub

Explanation:

• " ([A-Z])" with wildcards matches space + uppercase.
• ^p\1 inserts a paragraph break before the uppercase letter.
• This method keeps formatting intact.

Conversion from other programs is almost always imperfect.

It may look OK but the underlying structure will be very different from what the document would be if created in Word. Documents converted from pdf (or really any other format) to Word can be tough to edit because the conversion process never has a one-to-one matching of how formatting is done under the hood. This means that a converted document will seldom be formatted in Word in a way that uses Word features well for that formatting. An example is multiple section breaks to change margins, where in Word you would simply change the paragraph indent. Margins and Indents in Word. Another example is that Word formatting of text is best done using Styles and those will not be used. It will all be direct formatting. That can make a huge difference in how easy it is to edit. The Importance of Styles in Microsoft Word.

With pdf files, if possible, find the file from which the pdf was created and edit that file, using the program that created it. Then if you need it in Word format and it is not, convert it directly to Word. This will cut out one conversion process and make for fewer editing problems.

When I really need the document in Word format and intend to do much editing, I create a new Word file and paste the content into it as plain text. Then I format it to match the original using Styles for the formatting as much as possible. This takes time; for me, it is worth it and saves a lot of frustration.