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The two advantages of self-service are that there is no waiting to be served and that there is a wide variety of choice.

Do we need to add again "complementiser-that" before "the second clause".

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No, you can omit it.

The two advantages of self-service are that there is no waiting to be served and there is a wide variety of choice.

Note that the pattern X are that there is Y and there is Z doesn't really add more information to this sentence (you are simply repeating forms of to be needlessly), just more words. A more compact and clear way of expressing this is:

The two advantages of self-service are no waiting to be served and a wide variety of choice.

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