Complex sentence: He first became a junior British Government minister in 1986, and became a member of the Cabinet from 1989 to 1992, and also formerly Chairman of the Conservative Party from 1990 to 1992, and he was also a European Commissioner from 1999 to 2004.
Split into simpler sentences: He first became a junior British Government minister in 1986, and a member of the Cabinet from 1989 to 1992. He was Chairman of the Conservative Party from 1990 to 1992, and European Commissioner from 1999 to 2004.