Open subs-rss.php in the sources folder and find the following part (its quite close to the top):
$replace = array( "",
"",
"\n[br][img]\\1[/img][br][br]\n",
"\n",
"\\1",
"\"",
"and",
"(",
")",
" ",
You will see the & symbol in there instead of the word and, simply replace the & with the word and like I have and it will work perfectly. It was driving me crazy for awhile before I found this part of the file and fixed it. It's a bit of a bug with this mod because the & symbol is used for XML (RSS) syntax so the mod doesn't see it as text, therefore it will cut off everything after an ampersand is found in a RSS feed when it tries to import it. Luckily the & symbol can be easily changed to the word and, and still have the same meaning.
Oh and there is a second part to the fix which I just remembered. You need to use your forums censored words filter to clean up the fixed ands. Go into your censored words list and add the following to it:
andamp;
&
&
&
Set all of them to be replaced with just the word and. Now anytime your forum encounters an ampersand it will be converted to the word and. With the fix to the subs-rss file, it will normally output ampersands as andamp; so you use the censor filter to clean it up so it just comes out as and. It's a bit of a bandaid workaround, but it works flawlessly for me and I haven't had the problem since I did it.