@Sara952
I do not recognize this problem.
A CSV file (Comma Separated Values) is a file where each field is separated by two comma's and will end up in one cell when succesfully imported in a spreadsheet.
Maybe your import feature is does not recognize the file correctly as a Comma Separated File, so then set it options manually .
Maybe this helps:
How to open csv files safely with microsoft excel
BTW If there is incidentally a comma in a text, like in a listing title, it can be easy corrected manually. If there are too many of such records, then perform a "find/replace" to the CSV file before importing it.