Complex sentence: The GPCRs associated with G protein-gated ion channels are not involved in signal transduction pathways and only activate these ion channels using effector proteins or the G protein subunits themselves (see picture).
Split into simpler sentences: The GPCRs associated with G protein-gated ion channels are not involved in signal transduction pathways. They only activate these ion channels using effector proteins or the G protein subunits themselves (see picture).