Complex sentence: He served as a backbench supporter of Bill Davis's government for four years, and became parliamentary assistant to the Minister of Citizenship and Culture on February 25,1985, when Miller replaced Davis as Premier of Ontario.
Split into simpler sentences: He served as a backbench supporter of Bill Davis's government for four years. He was named parliamentary assistant to the Minister of Citizenship and Culture on February 25,1985, shortly after Miller was sworn in as Premier of Ontario.