Sophia was exhausted and angry, she hadn't slept well for a week now. is this a run on? or a comma splice? or correct?

Sophia was exhausted and angry, she hadn't slept well for a week now is an example of comma splice

Explanation:

Comma splice occur when you incorrectly use commas to connect two independent clauses. Commas however work really well if you want to separate a series of items with conjunctions.

This is a perfect example of comma splice. Both the statements are independent clauses, because they make sense as individual sentences  

where are the sentences? post a picture

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.