Complex sentence: In November 1956, Dulles was strongly opposed to the Anglo-French invasion of Egypt in response to the Suez Crisis, although during the most crucial days he was hospitalized after surgery and out of the decision loop.
Split into simpler sentences: In November 1956, Dulles strongly opposed the Anglo-French invasion of Egypt in response to the Suez Crisis. However, during the most crucial days, he was hospitalized after surgery and out of the decision loop.