Question

求大佬分析下该句子结构，感谢🙏

Passwords designed to hide sensitive information such as credit-card numbers were onlyslightly more secure than those protecting less important things, like access to games.

Answer 1

这个句子的主语是passwords，were是系动词，only slightly more secure than those是表语，这里的those用来指代passwords。passwords和were之间的部分是定语，用来修饰前面的名词passwords，those后面的部分也是定语，用来修饰those。