书名：新TOEIC必考单字600
页数：p.351 part4
题目：The last provision in the contract states that if either party
determines it is his best interest to cancel the contract,
he is obligated to inform the other immediately of his intention.
疑问：
1.此句文法从that if...到the contract, 主词的范围是? 那个it是代表哪部份?
因为it is,我看不懂了.
2. 逗点之后,he is ...和his intention,这2个指的是同1人吗?
不好意思,自学但文法问题不知可上哪找资源,还麻烦大家指点1下
谢谢