I am migrating my photos from BrilliantPhoto to Photoshop Elements 4.0. BrilliantPhoto used different IPTC locations for People/Place/Keywords and Elements only uses one. I have figured out how to read and combine all the tags to the "Keywords" Tag. But when I try to import the photo into PhotoShop Elements it imports all the separate tags as one tag.( I tried it on MS Digital Image Suite with the same results). Before I use ExifTool it imports keywords separately(Keyword1 and Keyword2) but after I use Exiftool to add the other tags to IPTC:keyword location it imports them all as one string.

Here is the line I use to write to the file:

exiftool.pl -IPTC:Keywords="People1, People2, Place, Event, Keyword1, Keyword2" Photo.jpg

What am I doing wrong?