English question

Either "from" or "by" not both!

Technically only "by" if you want to make any sense.

Chairs don't normally come "from" windows. Unless you made a chair from a window. 😊🙃

Sounds good to me 🤷‍♂️

That can be seen as inaccurate or containing confusing preposition,

To clarify maybe modify it to "I took this chair from where it was, by the window".

You don't need 2 prepositions. Take your pick: from or by

Thank you everyone for answering.

What I'm not sure about is if it's okay to say "from by something"

like, from by the door, from by my side, etc.

from is a preposition and by is too.

From and by sound odd together
Id put:
I took the chair from underneath the window

Or you could just put

I took the chair from the window

I took the chair by the window sounds wrong too

Yes, it is acceptable, context wise.

If you wanna be more direct, you can change it into something like...

"I found this chair beside (OR near) the window."

Yes, it's correct. You have said that you took the chair and where from. It was by the window, which you described.

"I took this chair from the window" if it is a very specifoc chair or just "I took the chair from the window"

I took this chair, that was beside the window. 🤷🏼

Yes, it is grammatically correct.

Yeah i think so

Sure

I took the chair by the window.
Or I took the chair which was by the window.