Complex sentence: A technical challenge is that, because the power wiring is unshielded and untwisted, the wiring acts as an antenna, so that the wiring emits radio energy, causing interference to the existing users of the same frequency band.
Split into simpler sentences: A technical challenge is that because the power wiring is unshielded and untwisted, the wiring acts as an antenna. So that the wiring emits radio energy, causing interference to the existing users of the same frequency band.