Text To Columns

I've read through several previous posts on this topic, but I'm still unable to get this to work. I have a list of names that appear as "Last, First" in one column. In order to be able to perform other functions using these names, I need them to be split into two columns with no comma. In excel, this is easy - there is a text to columns wizard that enables this. I can't find this in Numbers. I converted the column into a .csv file, but when I open the file, no option to separate the text appears.

Thanks in advance!
db