"wherein he" is correct and usable in written English
It is used to refer to the content of a previous clause. For example: "The book contained a hidden message, wherein he revealed his true feelings."
Prohibiting Ophelia from seeing Hamlet, however, has cast Hamlet into "the madness wherein he now raves".
Fox, movie magnate, who offered contracts to producers wherein he agreed to back Bway.
It showed itself in his critical essays, wherein he lucidly explained and logically applied his criteria.
Cuomo has an agreement with Dwyer's estate wherein he will receive some of the money from them.
Or so said Mark Zuckerberg in an interview published on Wednesday, wherein he sketched Facebook's grand ambitions for virtual reality.
"Case closed," Fred Kaplan concludes in an informative post at Slate, wherein he describes himself as a reformed conspiracy buff.
Mr. Ramsay's second show, "Kitchen Nightmares," wherein he tries to reform failing restaurants, is three years old.
He led an uprising in northeastern Bulgaria in 1277 wherein he and his army gained multiple victories against the Tartars.
I suggest that he try the one-volume Oxford Companion to Ships and the Sea, wherein he will find reference to these two perfectly valid nautical terms.
The earliest references to Jesus are from Paul, wherein he is not just one of many Messianic aspirants, but more even than that.
Both she and her husband proudly extol a life wherein he never changes a diaper and she makes sure she's always got her makeup on and dinner ready.
