Fate is a power that some people believe controls and decide

Fate is a power that some people believe controls and decides everything that happens,in a way that cannot be prevented or changed.
请问 controls and decides在这里是什么词性?
that some people believe controls and decides everything that happens是不是都修饰 power?
that some people believe （that）controls and decides everything that happens?句子语法能分析下么,好奇怪.
意思能看明白,就是说 命运是种力量能决定控制事物发生啥的,但是这里语法好复杂..求教