The subordinate clause is "When the delivery man arrives" because 1. it is introduced by "when" and 2. we can ask question to the main clause about this one.
Answer: Maritn Luther was once sentanced to a crime he commited a long time ago, he was freed of all charges against him from an all white men court
Explanation:
the court-room must have seen something in Martin Luther King and thought better of it.
Both of my daughter's husbands cook terribly.
Cambridge University offers full admission to women.
Answer:
to protect the jobs of skilled workers
