Complex sentence: Burns arranges a meeting with his informant to learn more about the situation, however, when Burns arrives to the Harbor to meet with Fox, he find out that Fox has been murdered and is suddenly attacked by an unknown armed group.
Split into simpler sentences: Burns arranges a meeting with his informant to learn more about the situation. However, when Burns arrives to the Harbor to meet with Fox, he find out that Fox has been murdered and is suddenly attacked by an unknown armed group.