local lfs = require("lfs")

function lfs.mkpath (path)
    local dirpath = ""
    for dirname in path:gmatch("[^\\/]+") do
        dirpath = dirpath .. dirname .. "/"
        lfs.mkdir(dirpath)
    end
end

lfs.mkpath(
    'dir level_1 num_1/dir level_2 num_1/dir level_3 num_1/'..
    '../dir level_3 num_2/'..
    '../../dir level_2 num_2/dir level_3 num_1/'..
    '../dir level_3 num_2'
)

Creates a complex folder structure

lua mkpath function

Lua