I did all that, and the result was mixed.
The main profile title is John (Searles) Hickey
It looks like the person's name is John Hickey. My relatives will be looking for William H. Hickey, so they will miss out on this interesting story. I guess people who live in New Brunswick, Canada might find the title useful if they are trying to find out what became of John Searles.
The "subtitle" turned out as
"John (William H.) Hickey formerly Searles aka Surles, Searls"
It shows William H. Hickey, but the parentheses are misleading, and, again, it looks like the person's name is John Hickey.
It would be nice to have a kind of compound name field that combines two complete name fields, First one would make the name John Searles in the usual way, then make the name William H. Hickey in the usual way, and then combine them to make "William H. Hickey, formerly John Searles" or "John Searles, subsequently William H. Hickey".
I know it's not such a common thing, but transgender people tend to change their entire names (I know one personally). Also, some people who immigrate to the U.S. or other country change their entire names. When I was teaching ESL, a Thai person with a long, difficult name got it officially changed to "John Smith".