Complex sentence: Audio induction loops, sometimes referred to as telecoils or T-coils (from "Telephone Coils"), allow audio sources to be directly connected to a hearing aid, which is intended to help the wearer filter out background noise.
Split into simpler sentences: Audio induction loops generate an electromagnetic field that can be detected by T-coils, allowing audio sources to be directly connected to a hearing aid. The T-coil is intended to help the wearer filter out background noise.