Simple

-- Backing up _G
root = _G

print = root.print
run = root.dofile
error = root.error

iterator = {}
iterator.keyvalue = root.pairs
iterator.numerical = root.ipairs

local string = root.string
local table = root.table
local coroutine = root.coroutine
local math = root.math
local parallel = root.parallel

net = {}
net.open = root.rednet.open
net.close = root.rednet.open
net.status = root.rednet,isOpen
net.send = root.rednet.send
net.sendAll = root.rednet.broadcast
net.standby = root.rednet.receive

dns = {}
dns.register = root.rednet.host
dns.unregister = root.rednet.unhost
dns.lookup = root.rednet.lookup

convert = {}
convert.toNumber = root.tonumber
convert.toString = root.tostring
convert.getType = root.type

event = {}
event.network = "rednet_message"
event.mouse = "mouse_click"
event.keyboard = "key"
event.modem = "modem_message"

system = {}
system.handleEvent = root.os.pullEvent
system.shutdown = root.os.shutdown
system.reboot = root.os.reboot

debug = {}
debug.rawset = root.rawset
debug.rawget = root.rawget
debug.protect = root.xpcall
debug.execute = root.assert
debug.callEvent = root.os.queueEvent

import = root.os.loadAPI

download = root.http.get
upload = root.http.post

getRedstone = root.rs.getInput
setRedstone = root.rs.setOutput

openFileIO = root.fs.open

class = function(properties)
 if convert.getType(properties) ~= table then
  error("class properties must be provided in a table")
 else
  root.setmetatable({}, properties)
  properties.__index = properties
  return properties
 end
end

simple = {root, print, run, error, iterator, string, table, coroutine, math, parallel, net, dns, convert, event, system, debug, import, root.fs, download, upload, getRedstone, setRedstone, openFileIO, class}

return simple