Complex sentence: Her subsequent whereabouts were unknown throughout season three, although she continued to be in occasional contact with Jack via Internet Relay Chat, and arranged for her sister, Katya Derevko, to assist Jack and Sydney on occasion.
Split into simpler sentences: Her subsequent whereabouts were unknown throughout season three, although she continued to be in occasional contact with Jack via Internet Relay Chat. She arranged for her sister, Katya Derevko, to assist Jack and Sydney on occasion.