stringsplit multidimensional array

[Hawkwing]

So I have an array like this:

1, 2

3, 4

I used stringsplit with @crlf for a delimiter. So now how do I split each row in the array into two columns? Am I even going about this the right way?

[Authenticity]

#include <Array.au3>

Global $avArray1, $avArray2[1][2] = [[0]], $avTmp
Global $sStr = '1, 2' & @CRLF & '3, 4, 5' & @CRLF & '6, 7' & @CRLF & '8'

$avArray1 = StringSplit($sStr, @CRLF, 1)

For $i = 1 To $avArray1[0]
    $avTmp = StringSplit($avArray1[$i], ',', 2)
    
    $avArray2[0][0] += 1
    If UBound($avTmp) > UBound($avArray2) Then
        ReDim $avArray2[$avArray2[0][0]+1][UBound($avTmp)]
    Else
        ReDim $avArray2[$avArray2[0][0]+1][UBound($avArray2, 2)]
    EndIf
    
    For $j = 0 To UBound($avTmp)-1
        $avArray2[$avArray2[0][0]][$j] = $avTmp[$j]
    Next
Next

_ArrayDisplay($avArray2)