Complex sentence: After being Minister for Information Technology from 1981, he entered the Cabinet as Secretary of State for the Environment in 1985, before serving as Secretary of State for Education from 1986 to 1989.
Split into simpler sentences: After being Minister for Information Technology from 1981, he entered the Cabinet as Secretary of State for the Environment in 1985. Baker served as Secretary of State for Education from 1986 to 1989.