how to expand a .pkg fiile in a pkg

hello,

I want to see the payload of a pkg file,

after i expand it using pkgutil --expand-full file.pkg [path], i see it is converted into a directory.

however, there are still two .pkg files in this directory.

and again i use pkgutil --expand-full, this time it fails, the error is

 "Could not open product archive: ./Delinea.ConnectionManager.pkg"

thanks