Complex sentence: When Diefenbaker led the Tories to victory in the 1957 election he appointed Fulton to cabinet as Minister of Justice where he was involved in negotiations to patriate the Canadian Constitution and developed the "Fulton-Favreau formula".
Split into simpler sentences: When Diefenbaker led the Tories to victory in the 1957 election, he appointed Fulton to Cabinet as Minister of Justice. As Minister, Fulton was involved in negotiations to patriate the Canadian Constitution, and developed the "Fulton-Favreau formula".