Original sentence: Campbell led the PC party into the 1993 election where they were decimated by the Liberal Party under Jean Chrétien, who had campaigned on a promise to renegotiate or abrogate NAFTA; however, Chrétien subsequently negotiated two supplemental agreements with the new US president.He was replaced as Conservative leader and prime minister by Kim Campbell
Edited sentence: He was replaced as Conservative leader and prime minister by Kim Campbell, who then led the PC party into the 1993 election where they were decimated by the Liberal party under Jean Chrétien had campaigned on a promise to renegotiate or abrogate NAFTA but broke his promise and negotiated two supplemental agreements with the new US president