How can I replace this string in sed?

Hi,

I have a large csv file with lines with strings like below
How can I convert this in sed for all lines?
The values can be anything, it's just that the list is in [u'xxx']

"[u'Kitts Corner', u'Jovita']", abc, "[u'AAA', u'BBB', u'CCC']"
to
"Kitts Corner,Jovita", abc, "AAA,BBB,CCC"

Thanks
Jamie