Complex sentence: The hypodermic needle model (also known as the hypodermic-syringe model, transmission-belt model, or magic bullet theory) is a model of communications suggesting that an intended message is directly received and wholly accepted by the receiver.
Split into simpler sentences: The hypodermic needle model (also known as the hypodermic-syringe model) is a model of communications also referred to as the "magic bullet" perspective, or the transmission-belt model. Essentially, this model holds that an intended message is directly received and wholly accepted by the receiver.