There are many different ways to correctly punctuate that sentence. How you choose depends on how much emphasis you want to place on the two nested parenthetical elements. The basic sentence is the following:
"Your colleague thought you would find this useful."
The outer parenthetical element is "John Smith from Some Fictional Company" and you may choose not to set it off, or you may set it off from the basic sentence by either commas, parenthesis, or dashes. Any one of the following three is correct:
[li]"Your colleague, John Smith from Some Fictional Company, thought you would find this useful."[/li]
[li]"Your colleague (John Smith from Some Fictional Company) thought you would find this useful."[/li]
[li]"Your colleague - John Smith from Some Fictional Company - thought you would find this useful."[/li]
Interestingly, within the parenthetical element "John Smith from Some Fictional Company" in a second parenthetical element "from Some Fictional Company". The reason that it's a second parenthetical element is that you could quite easily say:
[li]"Your colleague, John Smith, thought you would find this useful."[/li](Again, you could use any of the three aforementioned punctuation options to isolate 'John Smith'.)
You have the option to use either of two remaining punctuation marks for the embedded parenthetical element. In other words, if you use commas for the outer element, then you may use either the parenthesis or the dash for the inner element, but not the comma. If you use the dash for the outer element, then you may not use the dash for the inner element.
Wrong: [li]Your colleague, John Smith, from Some Fictional Company, thought you would find this useful.[/li]
Ok: [li]Your colleague, John Smith (from Some Fictional Company), thought you would find this useful.[/li]
The only other rule that comes into play is that when dash is used
and the inner element ends at the same location as the outer element, then you do not use the closing dash. In the case, you only use the first dash.
Wrong: [li]Your colleague, John Smith - from Some Fictional Company - , thought you would find this useful.[/li]
Right: [li]Your colleague, John Smith - from Some Fictional Company, thought you would find this useful.[/li]
My choice would be to use commas for the outer element and nothing for the inner element. I would say:
[li]"Your colleague, John Smith from Some Fictional Company, thought you would find this useful."[/li]
Ok Dave, bring it on.
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Good Luck
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