It can't.

perl -pe 's/\W/\n/g'

This already removes essential PostScript characters like +, * ( ) ...

sort

this destroies the sequence

uniq

This will remove any duplictes so removes some more information

fmt -65 | rot13

fmt doesn't destroy anything more, neither does rot13.

Simply pyping the text through ro13 should reveal all the unique words from the original text but you will never be able to reconstruct the original without additional information.