Sad to say， this project has turned out to be mostly low-level findings about factual errors and spelling and grammar mistakes, combined with lots of head- scratching puzzlement about what in the world those readers really want.

head-scratching令人头疼的

puzzlement 困惑

【主干识别】

This project has turned out to be findings.

sad to say 插入语，“遗憾地说”；combined with lots of head-scratching puzzlement 非谓语结构作定语（这里修饰的是 findings）；about what in the world those readers really want 为介词短语，about＋句子，句子是由what引导的宾语从句，in the world为状语。

factual errors and spelling and grammar mistakes 这个并列结构是factual errors 和 spelling and grammar mistakes的并列；combined with 相当于一个连词。

非谓语结构的加入使得解析变得困难。

遗憾地说，这个项目最终被证明是一个很低级的研究，它只着眼于事实型的错误、拼写和语法的问题，以及很多关于读者究竟想要什么的困惑。