Type of sentence.
The sentence:
That’s one small step for man, one giant leap for mankind.
Is this a compound sentence?
2 answers 
I don't believe it is because "one giant leap for mankind" is a dependent clause. There is also no conjunction.
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answered Oct 15 '12 at 12:20
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Commas can be used in this way when we want to show a contrast.
I was 20, she 19.
The rain was heavy, the wind strong.
In your example, the noun phrase (it is not a clause because it has no predicate) one giant leap for mankind is being used in apposition – it is renaming or redefining one small step for man. It's the same construction as:
Armstrong was the first, a pioneer.
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answered Oct 17 '12 at 09:51
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