Complex sentence: The imaginary as a lacanian term entails connotes an illusion, seduction and fascination derived from an image of the body as coherent unity but is by no means unnecessary or inconsequential (as something that is illusory).
Split into simpler sentences: The imaginary as a lacanian term refers to an illusion and fascination with an image of the body as coherent unity. This illusion of coherence, control and totality is by no means unnecessary or inconsequential (as something that is illusory).