Complex sentence: He was elected to the Ontario legislature as the LIberal MPP for London, Ontario in 1948 and, in 1950 was a candidate in the Ontario Liberal leadership convention placing fourth.
Split into simpler sentences: He was elected to the Legislative Assembly of Ontario as the Liberal Member of Provincial Parliament (MPP) or London, Ontario in 1948. In 1950, he was a candidate in the Ontario Liberal leadership convention, placing fourth.