And one grest thing about them is that they give people a wa

And one grest thing about them is that they give people a way to make their dreams come true .这
And one grest thing about them is that they give people a way to make their dreams come true .这些节目很重要的是它们给了人们一个能让他们的梦想实现的渠道.这个句子为什么是主从复和句.主从复和句是什么.