比较句中的would otherwise have been expected语法结构

英文：Researchers calculated that there were 1,800 more suicides than would otherwise have been expected in the next four months

问：这里的would otherwise have been expected的语法结构如何理解，谢谢！

Researchers calculated that there were 1,800 more suicides than would otherwise have been expected in the next four months.

= Researchers calculated that there were 1,800 more suicides than it would otherwise have been expected that there would be in the next four months.

即比较分句省略了形式主语it 和真的主语从句that there would be. 主句的比较项为1，800 more suicides，其在比较分句的对应项为there would be后的主语，需要省略，不可以补全。