The reason why she left had remained unclear for 10 years until I received her letter 3 days ago.
Is this sentence correct?
Thanks.
Yes, except you don't need the word 'why'. Clive
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Ben0226Is this sentence correct?
Yes, but I'm tempted to change it a little.
The reason she left remained unclear for ten years — until three days ago, when I received her letter.
Small numbers (1 - 10) are better if spelled out in words.
More important, the "punch-line" is 'received her letter', so it makes more sense to put it at