Complex sentence: Although she was a commoner, because of King Hrathnir's reforms, she was able to acquire an education and ascend using her talent and intelligence; she had been branded a terrorist when Clarissa and Felius met her.
Split into simpler sentences: Although she was a commoner, because of King Hrathnir's reforms, she was able to acquire an education and ascend using her talent and intelligence. She was already branded a terrorist when Clarissa and Felius met her.