请教一下英语语法问题

Question

It's not just that he guards his privacy so carefully that he's arranged to meet in a motel room someplace in the Midwest —which is all he'd like us to specify—to talk about his fothcoming book,Chrinices, Volume One.
这句话怎么分析呀?
有哪些语法内容?是不是强调句呀?
小弟真的弄不明白.请那为大哥大姐给点解释,小弟提前谢过了!!
谢谢您的回答
请问which is all he'd like us to specify
是怎么解释的呀?是插入语?是修饰哪个单词的呀?

Answer 1

It是形式主语,真正的主语是to talk about his fothcoming book,

that he guards his privacy so carefully that he's arranged to meet in a motel room someplace in the Midwest —which is all he'd like us to specify这里全是从句,

that he's arranged to meet in a motel room someplace in the Midwest这里是上一句 he guards his privacy so carefully 的定语从句,则是解释he guards his privacy so carefully 这句话.

which is all he'd like us to specify的先行词是Midwest,是补语语从句子.