It's said that it will be far more comfortable than the International Space Station.为什么有is和said两个动词?

It's said that it will be far more comfortable than the International Space Station.
为什么有is和said两个动词?

被动语态,is said 作谓语It's said that 是据说的意思

It is said that ……是个固定句式 翻译成“据说……”
再如：It is reported that “据报道……”
It is considered that “据认为”
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这是宾语从句。
said 才是谓语动词。
后面的be是放在that从句里面的。
that后面的句子是said的宾语。。