Complex sentence: There was another Progressive Conservative leadership convention in late 1985; on this occasion, Sterling broke with Timbrell (describing the latter's post-election opposition to Catholic school funding as an opportunistic volte-face), and supported Larry Grossman.
Split into simpler sentences: There was another Progressive Conservative leadership convention in late 1985. On this occasion, Sterling broke with Timbrell (describing the latter's post-election opposition to Catholic school funding as an opportunistic volte-face), and supported Larry Grossman.