Identify the mistake: 'The reason is that he is extremely fatigued

There should be no problem detecting the error in the above statement. It is overloaded, simply put. It is overburdened by ‘the reason why is because’, a common tautological expression you should avoid.
nIn stating why something happened, each of ‘reason’, ‘because’, and ‘why’ will do. When they are combined, tautology often results. Here are acceptable options for the sentence:
nThe reason is that he is very tired.
nIt is because he is very tired.
nThe speaker or writer can also be dramatic in giving the reason by introducing a colon or question mark, thus —in the case of the latter — asking and answering a question within a compact space. Consider these:
nAde will not be here. Reason: he is very tired.
nAde will not be here. Reason? He is very tired.
nThis indicates that there is ample opportunity to avoid the cliché ‘the reason why is because’ or ‘the reason why is that,’ as well as other similar ones. Another example:
nTautological: The reason why democracy is not delivering great dividends in Nigeria is because many of our politicians are greedy.
nTautological: The reason why democracy is not delivering great dividends in Nigeria is that many of our politicians are greedy.
nCorrect: The reason democracy is not delivering great dividends in Nigeria is that many of our politicians are greedy.
nAlso good: Democracy is not delivering great dividends in Nigeria because many of our politicians are greedy.
nOkay: Democracy is not delivering great dividends in Nigeria due to the fact that many of our politicians are greedy.
nCorrect: Democracy is not delivering great dividends in Nigeria as a result of the greed of many of our politicians.
nCorrect: Why is democracy not delivering great dividends in Nigeria? Many of our politicians are greedy.
nCorrect: The reason democracy is not delivering great dividends in Nigeria: many of our politicians are greedy.
nAlso cool: The reason democracy is not delivering great dividends in Nigeria? Many of our politicians are greedy.
nOther tautological expressions to avoid
nWhat do you think is wrong with each of them.
nTinubu will return back to Nigeria next week.
nThe pen is a free gift from my sister.
nHe has forgotten his PIN number.
nThe ATM machine is faulty.
nOur next move will depend on the final outcome of the meeting.
nBased on my past experience, I won’t buy a used phone.
nThe MD said the package was an added bonus for the admin staff.
nWhat an unexpected surprise!
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