The police got to what was once an old school that the peasants used as a store

The police got to what was once an old school that the peasants used as a store.what引导的是宾语从句吗?把to去掉后what改为where呢?又变成了什么从句

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是的,what在这里引导宾语从句.what在这里作复合关系代词,可引导名词性从句,在这里等于the place that, 去掉to后,what改成where,就是状语从句了,如 I will go where I am most needed by our motherland.