1. What others think you think and what you think they think you think.
别人（猜）想你想什么和你（猜）想他们(猜)想你想什么.
这是两个并列句组成一个长句.
前半句：主语others,谓语think,宾语think you think(what),该宾语从句省掉引导词that；
后半句：主语you,谓语：think,宾语they think you think(what),这个宾语从句里又包含另一个宾语从句you think----是（they)think的宾语,其中宾语从句前都省掉引导词that.
2. She has wanted to become a nurse ever since she was a young girl.
这是个状语从句：自从她是小姑娘开始她就想做一名护士.
主句：主语she,谓语has wanted(现在完成时),宾语to become a nurse(不定式短语充当) ；
从句：ever since不充当句子成分 ,可看作先行词,从句主语she,谓语was,表语a young girl.整个从句充当主句的状语.