I think that you shouldn't have converted it to a dynamic disk. If you hadn't, you could have used some of the partitioning tools mentioned in the article for which I provided a link above.
I think that most (if not all) of the partitioning programs don't support dynamic disks and volumes.
One possibility for you could be to use a disk cloning program, such as Symantec Ghost, to produce an image of your hard disk, delete the dynamic volume, recreate it and then clone it back. You would need to check that the version of the cloning software you use does support dynamic volumes.
Obviously, before you start playing with anything, you should create backup of your data. Unless you don't mind loosing the data on your hard disk, in which case you would have probably already reformatted the hard disk and started from scratch again.