求一句托福TPO17 第一篇文章一个长难句的语法讲解

Widely reported, if somewhat distrusted, accounts by figures like the famous traveler from Venice.Marco Polo, of thewillingness of people in China to trade with Europeans and of the immensity ofthe wealth to be gained by such contact made the ideairresistible Possibilities for trade seemed promising, but no hope existed formaintaining the traditional routes over land A new way had to be found.
如果大量的报告还有那么一点不可信的话，那么威尼斯著名的旅行家的描述就更为形象了。马可波罗带回了中国人希望和欧洲人通商的意愿和对于欧洲人来说只要一纸合约便可以获得的取之不尽的财富，所有的这一切，都让欧洲人无法抗拒。但是这样的好事儿在传统的商路被封死和新的航线建立起来之前，也就只能想想了
意思我知道，但是整个句子的结构我没看出来…主谓宾是哪个组成部分、哪个是名词性从句、哪个是状语从句之类的，没搞明白……惭愧ing～求哪位大神讲解一下～

Widely reported, if somewhat distrusted, accounts by figures like the famous traveler from Venice.Marco Polo, of the willingness of people in China to trade with Europeans and of the immensity of the wealth to be gained by such contact made the idea irresistible。

subject : accounts

working verb: made
句子主干是: accounts made the idea irresistible.
其他全是修饰语
Widely reported 是Opening clause， 修饰主语accounts,说这个accounts是 widely reported
if somewhat distrusted 插入语，找主干意思时可以先暂时不看。
accounts by figures like the famous traveler from Venice.Marco Polo （1）
of the willingness of people in China to trade with Europeans （2）
and of the immensity of the wealth to be gained by such contact （3）
1.2.3都是修饰accounts的具体内容。找主干时也可以先忽略不看，直接奔向主谓宾，找到主干了，再看其他修饰语。

百度下载一个toeflKit 托福资料分享器，里面有分享的~~