Separating Attribute Values

Hello,

Im trying to import attributes that are in the same line in my CSV file separated by a comma.

I tried using this code in functions.php which was on the official page but is giving me an error.
[str_replace(“,”, “|”, {attributelist[1]})]

Basically I need to have these as separate dropdowns: and not in the same line.
Size{2} : S/M[19], L/XL[22], XXL/XXXL[388]

Any help would be appreciated.