Use Tag - Filename Converter on the tool bar:
Format string: %_folderpath%$regexp(%_filename%,'(.+)(-).+',$1)\%_filename%
Or
Use the "Format value" action.
Field: _FILENAME
Format string: %_folderpath%$regexp(%_filename%,'(.+)(-).+',$1)\%_filename_ext%
Note: these regex expressions will give unexpected results if "album1" or "album2" has a dash (-)