I still have the following doubts. I included the various alternatives. Thank you

1) Prospero calls Caliban a lying slave instead Miranda calls him a horrible slave. Is "instead" correct?
I would have used "while, whereas" or I would have started a new sentence with "Miranda, instead, calls him a horrible slave/ Miranda calls him... instead. (Can you please tell me which ones are possible?)
2) The settings are described in all the particulars. (correction: in every detail) Can I say "in every particular". Is the word "particular" possible in such a context?
3) Defoe doesn't revise (or didnt' revise) his work so his novels lack a coherent plot.
4)Caliban doesn't sympathize with them. (He doesn't get on well with Prospero and Miranda) Does "Sympathize" have the same meaning as "get on, have a good relationship"?
5) His novels are divided into different episodes linked by the presence of a hero. They had to be understood even by the less educated. (or even by less educated readers, is the sentence possible without "readers"?)

1) Prospero calls Caliban a lying slave instead Miranda calls him a horrible slave. Is "instead" correct?

I would have used "while, whereas" or I would have started a new sentence with "Miranda, instead, calls him a horrible slave/ Miranda calls him... instead. (Can you please tell me which ones are possible?) Your first sentence contains a major error -- a run-on. Yes, you should start a new sentence with "Instead" -- or, if you were to use "while" or "whereas" you'd need a comma after "slave."

2) The settings are described in all the particulars. (correction: in every detail) Can I say "in every particular". Is the word "particular" possible in such a context? It is possible, yes, but "in great detail" or "in all its details" would be better.

3) Defoe doesn't revise (or didnt' revise) his work so his novels lack a coherent plot. Remember -- present tense!

4)Caliban doesn't sympathize with them. (He doesn't get on well with Prospero and Miranda) Does "Sympathize" have the same meaning as "get on, have a good relationship"? No, they're different. http://www.answers.com/topic/get-along
and
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5) His novels are divided into different episodes linked by the presence of a hero. They had to be understood even by the less educated. (or even by less educated readers, is the sentence possible without "readers"?) Either phrasing will work, but I don't understand why "they had to be understood" -- ??