Remove extra spacing between two words

If you knew that the interword spacing was a constant value (e.g. 2), then you could use the Find/Replace tool and enter two spaces for Find, and a single space for replace. But, if there is variable interword spacing in your document, it will be labor-intensive to find and replace those irregularities likely with many undo keystrokes.

An additional thought for productivity…

Consider the export of your Pages document as a Word document and open it in LibreOffice v7.4. There, you can use a regular expression in your Find field to locate the occurrence of 2 or more spaces. In the replacement field, you enter a single space, and a Replace All does the work once. Then you save it as a Word 2007-365 Docx and reopen it in Pages again.

Find

([ ]{2,})

Replace (one space)

Use Find and Replace: Pages menu > Edit > Find or use Command F.