Here's the best piece of advice that I can give:

Fulfill Each Requirement Separately

Try and break down the program into different tasks and write a mini-script to achieve each task. Once they're all working, write a bigger script that does all the stuff you want. As you're working on the mini-scripts, you'll realise that something you thought was one task is actually several, so break that into more mini-scripts.

Then, when you get confused, you can come to us with the mini-script instead of the big script, which makes it easier for us and more comprehensible for you.

If I was working on solving your problem, I'd probably think..

1. read the file and print each line
2. write a script that can understand a line like Allowed  OURDOMAIN\1500Jennilsa Modify This Folder, Sub
3. write a script that takes the values from the script above and prints the correct HTML
4. do the above two steps for lines like Directory: G:\1500Jennilsa and Startup directory: and so on.
5. Somehow your script has to know that Allowed  BUILTIN\Administrators  Full Control  This Folder Only is a property of File: G:\xcacls.txt. Write a script that shows how you handle that.

Breaking it up like this also makes it easier to know where to start by making basically everything a valid starting point.

Good luck!
--Pileofrogs