Unhappy parents rarely are provoked to wonder这是主句部分；if they shouldn’t have had kids这个是做wonder的宾语成分,因此事宾语从句；but unhappy childless folks are bothered with the message that children are the single most important thing in the world:obviously their misery must be a direct result of the gaping baby-size holes in their lives.这整个部分是和前面部分并列的,称并列句.unhappy childless folks are bothered with the message这是后面部分的主句.that children are the single most important thing in the world:这个部分是做message的同位语成分,起解释说明的作用.obviously their misery must be a direct result of the gaping baby-size holes in their lives.这部分是同位语从句中的一部分.
不知道这样你看明别没有啊?