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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

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."

MrsCatInTheHat wrote: ↑12 Nov 2020, 07:32 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

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.

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.