Split improperly imported categories

I imported my blog from blogger to wordpress, and its new home is http://www.mikesubuntu.com/.

I am not sure if my use of labels on blogger was incorrect, but it worked very well for google pagerank. (Looking back now, I think I did not separate them with a comma. That was really stupid. D’oh.)

I imported the blog to wordpress, and noticed that the tags were imported as a single category. If someone googled a combination of these tags, my post would come up. Now, a post with the same info as a single “category” does not come up in a google search. Is there any way to fix this, short of going through manually?