Complex sentence: Upon capture, the assassin disclosed that his intended target was Martin Luther King Sr., who was elsewhere that Sunday, and so after failing to see Mr. King Sr., the killer instead fatally shot Alberta King and Rev. Edward Boykin.
Split into simpler sentences: Upon capture, the assassin disclosed that his intended target was Martin Luther King Sr., who was elsewhere that Sunday. After failing to see Mr. King Sr., the killer instead fatally shot Alberta King and Rev. Edward Boykin.