I know that I can place the adjuncts at the end of a sentence.
For an example:
He talks about the topic without knowing much about it.
But now I've seen a sentence that was:
He talks, without knowing much about it, about the topic.
First of all, isn't that against the word order Subject-Verb-Object? Is that grammatical? And where is a good source about placing adjuncts in sentences? Googling it, I didn't find one.