The copper conducts an electric current that heats the scalpel to make it self-cauterizing.
(The copper; conducts; an electric current that heats the scalpel) (an electric current; heats; the scalpel; to make it self-cauterizing)
The copper an electric current
conducts heats
an electric current that heats the scalpel
the scalpel to make it self-cauterizing