How do I keep all the values when I split a cell by delimiter (comma) in Google Sheets?

I have a spreadsheet in Google Sheets, where I am currently running a script.

There are two tabs, the first tab is the following:

The second tab is the following:

This is the script I am running:

function result(range) {  var output2 = [];  for(var i=0, iLen=range.length; i<iLen; i++) {    var s = range[i][6].split(", ");    var t = range[i][7].split(", ");    var u = range[i][8].split(", ");    for(var j=0, jLen=s.length; j<jLen; j++) {      var output1 = [];       for(var k=0, kLen=range[0].length; k<kLen; k++) {        if(k == 6)         {          output1.push(s[j]);        }        else if(k == 7)        {          output1.push(t[j]);        }        else if(k == 8)        {          output1.push(u[j]);        }        else         {          output1.push(range[i][k]);        }      }      output2.push(output1);    }      }  return output2;}

In the second tab on the spreadsheet, in cell A1 I have the following function:

=result(Data!A1:AA)

What I am trying to get out of the script is that the names listed in Columns G-I (in the first tab) split where there is a comma and all the surrounding data is kept the same.

As you can see in the second tab it only splits the names in column G, but column H & I it only keeps the first attendee.

Is there a way to modify the script to get it to split all attendees in columns G-I?