How can I recover data from .incomplete and .previous Time Machine backups?

I’m helping someone who has deleted their Time Machine backup by accident. All that is contained within the sparsebundle are .incomplete and .previous folders. I would like to recover as much data as possible so I need a way to combine all the changes from each folder essentially. Also I may first attempt to recover the deleted files with software, does anyone have preferences between R-Studio, UFS, or another software? And would scanning for deleted files work the same within a sparsebundle? Thanks!