If necessary, move download1 and download2 back to /target
The last step is probably not necessary, since your /target directory will not be under version control afterwards, you will need to checkout to a new directory anyway, this will then have your desired structure.
Quick-and-dirty solution:
/target/download1
and/target/download2
to/tmp
svn import /target http:/url.to.your.repo/trunk/path
download1
anddownload2
back to/target
The last step is probably not necessary, since your
/target
directory will not be under version control afterwards, you will need to checkout to a new directory anyway, this will then have your desired structure.