Apps Script to copy data from one column to multiple columns

copyData

function copyData() {  
  var mySheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  var range = mySheet.getDataRange();
  var firstNameCell = mySheet.getRange('A1');
  var lastNameCell =  mySheet.getRange('B1');
  var row = 1;
  //skip the header column
  var dataRange = range.offset(1, 0, range.getNumRows()-1).getValues();
  
  for (i = 0; i < dataRange.length; i++){
    if (dataRange[i][2]){
      firstNameCell.offset(row, 0).setValue(dataRange[i][2].split(" ")[0]);
      lastNameCell.offset(row, 0).setValue(dataRange[i][2].split(" ")[1]);     
    }
    row++;
  }
}