The author's purpose in this passage is to inform. The author is informing the reader on how Elizabethans would typically store their food. It goes into details of differences between food types and some options for storing food and getting nourishment in summer and winter.
Here's a completion of the passage in the question, and the likely answer:
(I believe you are asked to complete the passage, and find the missing words).
Fortunately, in that moment of “desperate extremity,” the Powhatans brought food and rescued the starving strangers. A year later, several hundred more settlers arrived, and again they quickly ran out of provisions. They were forced to eat “dogs, cats, rats, and mice,” even “CORPSES” dug from graves. “Some have licked up the blood which hathfallen from their weak fellows,” a survivor reported. “One member of our colony murdered his wife, ripped the child out of her womb and threw it into the river, and after chopped the mother in pieces and salted her for his food, the same not being discovered before he had eaten part thereof.” “So great was our famine,” John Smith stated, “that a savage we slew and buried, the poorer sort took him up again and ate him; and so did diverse one another boiled and stewed with roots and herbs.”
I can just give you a suggestion of a story that I have watched. It's " How the Grinch stole the Christmas". The theme of the cartoon is that Christmas is not about presents. One evidence from the cartoon is that after Grinch stole all the presents from the people's houses, they were still happy and they were singing together by holding hands like the presents were nothing for them. At the end the Grinch realized his mistake and gave back all the staffs that he stole.
I hope it helps a little.
The adjective clause in this sentence is 'who has read thousands of books'. It is an appositive, separated from the rest of the text by commas, and has an adjectival meaning - it modifies the noun, Anthony.