Can anyone help me rephrase this sentence?
"Lost amid the election-year wrangling over the militants’ attack on the United States Mission in Benghazi, Libya, is a complex back story involving growing regional resentment against heavily armed American private security contractors, increased demands on State Department resources and mounting frustration among diplomats over ever-tighter protections that they say make it more difficult to do their jobs."
I found this sentence quite difficult to understand. Can anyone help me analyze its grammatical structure? Thanks