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There seems to be something wrong with this sentence., or some different structure I have not heard of so far. Can you please help me understand the sentence?

"The sun's gravitational pull on the moon is more than twice that exerted by the Earth"

I can understand the highlighted part here but not the one above. e.g : "The Sun's gravitational pull on the moon is twice more than that exerted by the Earth" Apparantly this is a ruduction of (...that which is exerted). Yet with or without a reduction, the first sentence sounds incomprehensibly odd to me.

I can understand this highlighted part too : "The Sun's gravitational pull on the moon is more than twice that is exerted by the Earth"

What's missing in the first sentence- if any? What kind of a sentence is this yaw? I need a parsing and a paraphrase.
Comments  
that is a pronoun. It stands for the pull.

The sun's pull is twice (more than) the pull exerted by ...

The use of that with this meaning is common in comparisons.

Compare:

Man's ability to reason is at least as good as that of a chimpanzee -- perhaps even greater. (that
= the ability to reason)
The building across the street has a height greater than that of the building down the road. (that
= the height)
The fashion in New York is much more sophisticated than that worn in Detroit. (that
= the fashion)

CJ
CalifJimthat is a pronoun. It stands for the pull.

The sun's pull is twice (more than) the pull exerted by ...

The use of that with this meaning is common in comparisons.

Compare:

Man's ability to reason is at least as good as that of a chimpanzee -- perhaps even greater. (that
= the ability to reason)
The building across the street has a height greater than that of the building down the road. (that
= the height)
The fashion in New York is much more sophisticated than that worn in Detroit. (that
= the fashion)

CJ

Thanks Jim, but in the sentence I sent I can't see an "of" after that. Is it normal?
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I think Kili finds the place of TWICE weird. Can TWICE be used as an adjective in front of a noun or a pronoun?
You have "exerted by" intead of "of."

The pull is twice that of the earth. The pull is twice that exerted by the earth. Those are the same.
ofis not required. I don't know where you got that idea. Emotion: smile

Compare your sentence to mine about fashion. There's no of in that worn in Detroit.

that exerted = the pull which is exerted
that worn = the fashion which is worn


So what you have in both cases is "Whiz Deletion" - removal of which is - before a past participle.

Yes, it's normal.

CJ
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and no difference between 'more than twice that exerted..' and 'twice more than that exerted...' either?
Anonymousand no difference between 'more than twice that exerted..' and 'twice more than that exerted...' either?
NO, they are different.