the man I taught

[Navi]

Which is correct:

1-The man I taught how to repair the computer has left the company.
2-The man I taught how to repair the computer to has left the company.
3-The man to whom I taught how to repair the computer has left the company.

[Beeesneees]

1 is the best of those options, but it still sounds slightly awkward.
I'd probably recast it:
I taught a man to repair the computer but he has now left the company.
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Cheers m' dears!