[Grammar] Which is a correct understanding?

Nothing should be done in a hurry that can be done slowly.

A. Nothing should be done in a hurry. + Nothing can be done slowly.
B. Nothing should be done in a hurry. + The thing can be done slowly.
C. It is impossible to divide this sentence into two sentences.

Which is a correct understanding (or a better understanding), A, B, or C?

Thanks for your kind help.

[Raymott]

Originally Posted by 20080709

Nothing should be done in a hurry that can be done slowly.

A. Nothing should be done in a hurry. + Nothing can be done slowly.
B. Nothing should be done in a hurry. + The thing can be done slowly.
C. It is impossible to divide this sentence into two sentences.

Which is a correct understanding (or a better understanding), A, B, or C?

Thanks for your kind help.

B and C are vaguely correct, depending on your understanding. It's probably best to rephrase it.
(in order to understand it. The sentence itself is fine).
Nothing that can be done slowly should be done in a hurry.
If you can do something slowly, you shouldn't do it in a hurry.
If there is something you have to do, and you have the choice of doing it in a hurry or slowly; you should do it slowly.

[stuartnz]

Originally Posted by Raymott

If there is something you have to do, and you have the choice of doing it in a hurry or slowly; you should do it slowly.

(not a professional teacher) I really like this one, I think it does an excellent job of making very clear the meaning of the original sentence.