The dataset contains too many columns... I first need to combine several columns into one to make it work. For instance, details around somebody's previous job is spread over many columns. 'PreviousJob0Title' 'PreviousJobCompanyName' 'PreviousJobSstartDate' 'PreviousJbDescription' ... and there are many previous jobs. So I want to combine data from multiple columns to make one 'Previous Job 1' column that contains everything about that role