listserv archives

[Evans Winner]

Hi.  I'm not sure if this is a good place to ask, but maybe
someone here can give me a pointer.  I was subscribed to a
listserv for which the admins pulled the plug, so on its
last day of existence (its existence, not mine) I had the
listserv send me all its archive files.  So now I have a 96
Mb file that is the concatenation of all those monthly
archive files.

So, the format of the messages in the archive is such that
each message starts like this (including the line of `='
signs):

=========================================================================
Date:         Thu, 1 Jan 1998 18:26:39 -0500
Reply-To:     Joe Shmoe <shmoe@INDIANA.EDU>
Sender:       Foo-L <foo-l@indiana.edu>
From:         Joe Shmoe <dlopes@INDIANA.EDU>
Subject:      Some subject
Comments: To: foo-L <foo-l@indiana.edu>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

Message text.


Can anyone give me advice about how to turn this into
something gnus can read as a threaded group?