I'm having trouble figuring out how I can uncompress these parts into one file. I've tried "zip *.zip > file.zip" with no success.
While unzip seems not to support multipart archives (you'd need to concatenate them into a single archive first), unar or 7zip seem to be working. However, the files would need to be named archive.z01, archive.z02, ... , archive.zip
https://unix.stackexchange.com/questions/40480/how-to-unzip-a-multipart-spanned-zip-on-linux