Using such an old version of filemaker does limit your options here.
You could pull the data together in this fashion with a script as long as you run this script after each edit that would change your list or related records...
Use Go to Related records to isolate your group of related records.
Select a layout where only the fields you want to pull data from are listed.
Use Copy All Records to copy this data to the clip board
Paste this text into a text field.
The pasted date will be in the format:
You can then use the subsitute function in a calculation field ( or set field) to replace the tab and return characters with other characters if you need to.
Thanks. I'll give it a go and report back.