Complex sentence: Operation was based on either Apple BASIC, a modified version of the "Logo" programming language, or a version of the Forth programing language with an RF or infrared transmitter attached to a personal computer.
Split into simpler sentences: Operation was based on one of two programming languages, either Apple BASIC, a modified version of the Logo language, or a version of Forth. Communication was via a radio or infrared transmitter attached to a personal computer.