punctuation in compound/complex sentence

[shravsi]

Older kids will enjoy it too though the story might seem too simple for them.

In the above sentence, my review editor has suggested adding a comma after the first 'too'. I also feel that the sentence sounds better with comma. But the reason I removed is that Grammarly marked it as punctuation in compound/complex sentence.
Grammar angels, please help me with what I am doing wrong?
I would also appreciate any links/resources/books/websites about compound sentences, as I am still learning the intricacies of English grammar.
Thank you

[MrsCatInTheHat]

Grammarly is not perfect and makes odd suggestions at times. The bottom line is that you need to know your grammar. Proofreading software is really only a back up to double-check things. Check Purdue's Owl website. It can be helpful. On that note, a comma would be appropriate after, "too."

[shravsi]

Grammarly is not perfect and makes odd suggestions at times. The bottom line is that you need to know your grammar. Proofreading software is really only a back up to double-check things. Check Purdue's Owl website. It can be helpful. On that note, a comma would be appropriate after, "too."

Thank you

[emidio125]

I personally think there was a need to include a comma after the first too. Sometimes we have to join forces between grammar checkers and our own knowledge.

[Diana Lowery]

I am not a grammar angel, but this might help:

3. In place of ‘however’ or ‘but’

E.g. “I do not usually drink coffee, though I’ve had 2 cups today.”

Used after a comma, in the middle of a sentence, the word ‘though’ (or ‘although’) can be used to
mean the same as “I do not usually drink coffee, but/however* I have had 2 cups today.”

Your sentence is a compound sentence with two independent clauses, so it needs a comma and a conjunction if the word is deemed an actual conjunction.

Grammarly likely considered the word "though" as a subordinating conjunction with a clause at the end of the sentence which would make it a complex sentence, so no comma was needed.

I think the comma might be debatable.