Complex sentence: Jack recognises the threat and realises that the solution is to give all the team pills to erase their memories of the past forty-eight hours but is faced with the knowledge that if he takes the pill he will lose all memories of his father.
Split into simpler sentences: Jack recognises the threat and realises that the solution is to give all the team pills to erase their memories of the past forty-eight hours. However he is also faced with the knowledge that if he takes the pill he will lose all memories of his father.