请问下面句子是什么从句,that和what用做什么,逗号后是什么psychologists have known for decades that what's going on ,inside our head affects our senses.

问题描述:

请问下面句子是什么从句,that和what用做什么,逗号后是什么
psychologists have known for decades that what's going on ,inside our head affects our senses.