Complex sentence: O'Leary became a member of the Conservative Party shortly before the party's 2016 convention and in December 2016, O'Leary revealed an exploratory committee that included former premier of Ontario, Mike Harris.
Split into simpler sentences: O'Leary became a member of the Conservative Party shortly before the party's 2016 convention. In December 2016, O'Leary revealed an exploratory committee that included former premier of Ontario, Mike Harris.