Bad as this sentence appears to be because it does not really say what "this" is, the clause is independent. Subject: they Predicate: do Predicate Nominative: this. This is actually (in this case) a pronoun.
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.