去掉 that day，简化句子：
As many new cases were launched up every 90 minutes as had been recorded in total by February .
整个句子是一个复合句。黑体部分为主句，后面的是从句，是比较状语从句。结构为：as...as...
第一个as 是程度副词，修饰主句中的 many，它是用来比较的；第二个 as 是“比较代词”，引出比较从句，且在从句中作成分。
主句的成分：
As many new cases （主语）were launched up （谓语动词）every 90 minutes（状语）

从句的成分：
as （主语。比较代词在从句中作成分）had been recorded （谓语动词）in total by February（状语）
又如：
Tom eats as much food as is needed for his training. 汤姆吃的饭跟训练所需的量一样多。