"the harsh restrictions provoked anger and outrage in the public," is an independent clause. An independent clause is a clause that can stand alone as a sentence and does not need any other parts.
"During the long winter" is an adverbial clause, which means it is describing how something is before the sentence. It could be more closely compared to a dependent clause because it cannot act alone in a sentence.
Meaning by that they are the lords/guardians sons or daughters of the time being.
