I have a question
Hello I wonder about this sentence
"if you were to write out your brain's potential as expressed by the number
of possible neural connections it could make, it would take you seventy-five years to write out all the zeros
can I change "as expressed" into "expressed?
I also wonder what is omitted between as and expressed
Is it "it was"?
Thank you all the time

Question

Answer

There's nothing wrong with the sentence. :)

"If you were to write out your brain's potential..." - How? In what way? Creatively or technically? Or another way?

"...as expressed by the number of possible neural connections it could make..." - In this way. So, we have a quantitative measure.

Removing "as" would be a mistake. The sentence would become broken. Adding "it was" would also be a mistake.  The useful phrase here is "as expressed by (this)", to mean "shown in this way".

Answer

I think it would be okay to replace 'as expressed' with 'expressed'. There is nothing omitted between as and expressed.

I hope I helped you out. Do you have any other questions?