Complex sentence: "Gimmick" is the name of a very simple kind of capacitive coupling; a gimmick is a piece of wire that is placed in proximity to another one, providing a capacitive coupling between two nodes of a few picofarads in value.
Split into simpler sentences: Gimmick is the name of a very simple kind of capacitive coupling. It is a piece of wire that is placed in proximity to another one, providing a capacitive coupling between two nodes of a few picofarads in value.