I know this is a bit outdated, but either way..
The easiest way to solve this is by opening up the XML sheet in Notepad++ and look in your policies for rules with multiple sources, destinations, and applications. When you find one, copy the closing bracket for one entry all the way to the end of the opening bracket for the next one (including spaces and all). Then, use the replace tool. Set it to look for what you just copied and replace it with \n (make sure Search Mode is set to Extended).
Do this for all the other entries (Source, Destination, Application), save your XML, import into Excel.
Example of entry to copy:
</source-address>
<source-address>