Normally you do not. However, this is different. You are interjecting a separate thought and you set it off by commas.
Which means basically, that if you removed the words between those commas, the entire sentence would read correctly all by itself. By the way, the word is not "unbeknown" - the correct word is "unbeknownst." Q: What's the definition of unbeknownst?
A: unbeknownst: (usually used with 'to') occurring or existing without the knowledge of; without someone's knowledge. Source: www.kgbanswers.com.
Hubby is correct - it isolates a subordinate clause and is quite acceptable. You could achieve the same effet with parentheses (brackets). It is also OK to put it BEFORE the last 'and' in a list - and it is known as the Oxford Comma - not alot of people know this.
Very useful if your list also includes pairs - eg: "Famous retailers on the High Street used to include Swan and Edgar, Marshall and Snelgrove, and Debenham and Freebody.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.