Advice badly needed

[virginiawang]

" Not until yesterday had I arrived at a decision to read more when I found a grammatical mistake in my writing." Is it correct or not? What do you think?

I registered with a grammar forum, in which a teacher corrected my sentence into the following, " I had not arrived at a decision to read more, until I found a grammatical mistake in my writing yesterday." I think they are the same. How do you think?

[SleepyWitch]

again, as in your other thread, this seems to imply 'I will read more whenever I find a grammatical mistake', not When I found a grammatical mistake, I decided to read more. I think you're trying to cram too much information and too many structures into one sentence. Do you see what I mean? By placing 'when I found a grammatical mistake' at the end of the sentence, it is too far away from 'Not until yesterday...' for the reader to understand that they go together. So the reader is forced to look for a part of the sentence that he can attach 'when I found a grammatical mistake...' to. Because 'Not until...' is too far away, he tries to attach it to the nearest bit he can find, i.e. 'a decision to read more'. ---> a decision to read more when I found a grammatical mistake. I.e. the person will read more every time they have found a mistake. But what you want to say is that the person will read more in general, to avoid mistakes, not that they will read after they've made a mistake.

[Mathor]

you do not have to word things the way she did, but you're certainly missing a comma in yours.

Also, the way you organized your words makes the sentence sort of hard to follow.

I would go for:

Yesterday, when I found a grammatical mistake in my writing, I arrived at a decision to read more."

[virginiawang]

Thank you, Mathor.
I do need a comma here.
The sentence is a bit weird, but it was not the original sentence I wrote. I made a sentence which is similar in structure to my original sentence, to post here and ask. The sentence you recommended is great, but it did not really express my idea. I had long wished to do sth, but I didn't do it until yesterday. Around the same time, sth else happened quite by chance. I might have hinted at the fact that sth else that happened triggered my action, but I didn't want to make it very clear. Do you think it is OK to read a sentence like that?