Extra subject after the relative pronoun

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  • Hermione Golightly

    Senior Member
    British English
    The second 'it' is essential, but 'that' could be omitted to give 'It's so silly, it makes people laugh.'
    The consturction is 'something/somebody is so something (that) it + verb clause',
    I have put a comma instead of 'that' to represent the slight pause in speech.
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