Complex sentence: Macmillan, obsessed with economic expansion, constantly belittled Lloyd in his memoirs, and in Mount's view his sacking of Lloyd was a watershed in economic policy, opening the way to the inflation of the 1970s, just as Suez was in foreign policy.
Split into simpler sentences: Macmillan, obsessed with economic expansion, constantly belittled Lloyd in his memoirs. The sacking of Lloyd was a watershed in economic policy, opening the way to the inflation of the 1970s, just as Suez was in foreign policy.