The mechanic had an accident.
He is very successful.
The mechanic who is very successful had an accident.
The mechanic who is very successful had an accident.
When you ask "which sentence is correct", are you referring to the last two sentences? If so, they are the same. I suspect they were supposed to be different and you have mistyped something.
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When you ask "which sentence is correct", are you referring to the last two sentences? If so, they are the same. I suspect they were supposed to be different and you have mistyped something.