Make a plugin execute multiple commands on command.

Hey!

First of all: Im quite new to plugin developing. Just saying.

So, i want to make a make a command that executes multiple commands when that one command is executed.
For example; i do /leave, and then that command executes /paintball leave and /server lobby at the same time (EXAMPLE). How can i do this?

Thanks in advance!
Greetings, Wietze.