考研英语长难句President Bush campaigned to move Social Security to

是伴随状态.主语President Bush,谓语move,宾语Social Security,把Social Security搬到a saving-account model里面,方式为让retirees用大部分guaranteed payments在investment中获利,从而保证社会稳定.with引导方式从句,为伴随状态.
再问： with retirees trading much or all of their guaranteed payments for payments depending on investment returns.这好像不是一个句子吧（我的意思是少成分）？
再答： 对呀，不是句子。with sb doing sth，固定搭配，表示伴随状态，类似的还有with the lights on、with a leg lying on the floor 等