The wires form an electrical circuit which, if broken in the event of the glass sheet being smashed, sets off an alarm.
(The wires; form; an electrical circuit which, if broken in the event of the glass sheet being smashed, sets off an alarm) (the glass sheet; being smashed; ) (an electrical circuit; sets off; an alarm)
The wires the glass sheet an electrical circuit
form being smashed sets off
an electrical circuit which, if broken in the event of the glass sheet being smashed, sets off an alarm
an alarm