主干：the fact suggests that…
The very fact (that dreams like Jack's are common 同位语从句)suggests (that college is a stressful situation for young people.宾语从句)

这句话stressful前面缺了个a吧

The very fact 主语
that dreams like Jack's are common 主语的同位语从句
suggests 谓语
that college is stressful situation for young people 宾语从句

这句话好在主句的主语和同位语从句的主语单复数不同，否则会更难辨析。