1)Voltaire presents his ideas of injustice through comedy by exaggerating the aristocrats’ life style.

In this sentence do I include an "s" after style? Also, which is correct in this sentence, "life style" or "lifestyle".

2)Voltaire’s representation of Candide’s father is a mockery of the hierarchy of the aristocracy and a reminder that an individual’s personal attributes are overlooked.

Is "hierarchy of the aristocracy" okay in this sentence? I'll appreciate your help.

1)Voltaire presents his ideas of injustice through comedy by exaggerating the aristocrats’ life style.

In this sentence do I include an "s" after style? Also, which is correct in this sentence, "life style" or "lifestyle".

It would be better to say "lifestyles" since you can't prove that all the aristocrats lived exactly the same lifestyle!!

2)Voltaire’s representation of Candide’s father is a mockery of the hierarchy of the aristocracy and a reminder that an individual’s personal attributes are overlooked.

Is "hierarchy of the aristocracy" okay in this sentence? I'll appreciate your help.
The problem is repetition and boredome: "a mockery of the hierarchy of the aristocracy" -- too many words so close together with -y sound at the end. Try this: Voltaire’s representation of Candide’s father mocks the hierarchy of the aristocracy...

There are still two -y sounding words, pretty close together. What revision can you think of to say the same thing but eliminate that repetition?

??

(boredom, not boredome!)

can I say aristocrats instead?

Yes, that would work well.

1) Regarding the first question, you should include an "s" after "style" to make it plural, as you are referring to the lifestyles of multiple aristocrats. As for "life style" or "lifestyle," the correct term to use in this sentence would be "lifestyle." "Lifestyle" is a commonly used term that refers to the way a person or group lives or defines their way of life. It is a single word and is more appropriate in this context.

2) Yes, "hierarchy of the aristocracy" is fine in this sentence. It conveys the idea that there is a social structure or system of ranking within the aristocratic class, wherein certain individuals hold higher positions of power or privilege than others. The phrase you used accurately captures this concept and fits well within the sentence.