The result is an impressive work of self-scrutiny, occasionally mournful but often funny, rich with insight about what it means to move forward as a divided self.

【翻译】结果诞生了一部感人肺腑的、自我反省的作品，其语言偶尔忧郁悲伤，但又常常幽默荒诞，富有洞察力地探索了作为分裂的自我努力前行的意义是什么。

我认为，该句在move 之前漏掉了不定式符号to，应为：what it means to move forward as a divided self，这样的话，不定式to move forward as a divided self 作真实主语，it 作形式主语。整个what 从句是名词性从句，作about 的宾语。又如：

Do you have any idea what it means to be poor?

你知不知道贫穷意味着什么?

I know what it means to lose a child under such tragic circumstances.

我明白在这种悲惨的情况下失去孩子的滋味。

来自柯林斯例句

I've thought about what it means to be the president. 

我一直在思考这样一个问题：当总统意味着什么?

They taught me about what it means to be a father and to raise a family.

他们教我当一个父亲并养育一家人的意义是什么。

【句子结构分析】

The result is an impressive work of self-scrutiny, occasionally mournful but often funny, rich with insight about what it means to move forward as a divided self.

1. The result is an impressive work of self-scrutiny：句子主干部分，为主系表结构。

2. occasionally mournful but often funny, rich with insight about what it means move forward as a divided self：整体是个形容词短语，作后置定语，修饰作品 work。相当于一个非限制性定语从句：which is occasionally mournful...

3. 在形容词短语中，包含名词性从句what it means to move forward as a divided self，作about的宾语。

4. mournful, funny, rich：三个并列形容词，构成了这个形容词短语。其中rich 带上了介词短语with insight，说明“富有洞察力”，about 到句子最后，整体是个介词短语，作了名词insight 的定语。