不了解有没这种说法,是算作复合从句吗？譬如这个句子
residents angry at what they felt were false promises of better security.
what引导的应该是宾语从句吧? 但what they felt又是一个主语从句吧? what可以同时作为两个从句的引导词吗？
residents angry at what they felt were false promises of better security
——这不是一个完整的句子，而是一个名词性短语。
residents是中心词；angry at what they felt were false promises of better security是形容词短语作定语，等于定语从句：who were angry at what they felt were false promises of better security
简单剖析如下：
1. what they felt were false promises of better security是at的宾语从句。
2. they felt是插入语，等于they thought。
3. 宾语从句成分划分： what （主语）were （系动词）false promises of better security（表语）
宾语从句的意思是：在他们看来所谓的更有安全保障的不真实承诺
