There is a sentence that I could not fully understand.
"Most automobile thefts are the work of professional thieves against whose efforts antitheft devices offer scant protection."
Can someone explain what this sentence means?
Also, could someone explain how the sentence is grammatically structured (ex. the word "whose" modifies something ... etc)?
The part right after "whose" sounds weird because both "efforts" and "antitheft devices" are nouns.