Complex sentence: Assuming that Brody will never have another opportunity to complete his mission, senior CIA officers order his assassination, however with help from Carrie, Brody escapes and goes to meet Akbari himself, claiming to possess sensitive information about Javadi.
Split into simpler sentences: Assuming that Brody will never have another opportunity to complete his mission, senior CIA officers order his assassination. However, with help from Carrie, Brody escapes and is able to arrange a meeting with Akbari, claiming to possess sensitive information about Javadi.