The most radical change we have made is to analyze DC and RC circuits initially in terms of electric field and surface charge on the wires, before introducing the more abstract concept of electric potential.
(we; have made; ) (The most radical change we have made; is; to analyze DC and RC circuits initially in terms of electric field and surface charge on the wires)
we The most radical change we have made
have made is
to analyze DC and RC circuits initially in terms of electric field and surface charge on the wires