Complex sentence: Having joined Shell in 1974 from 1998 he was Managing Director of Shell UK Exploration and Production, in 1999 he became Shell Country Chairman in the UK, in 2002 he became a managing director of Royal Dutch, and from 2004 was Managing Director of Shell Transport.
Split into simpler sentences: Having joined Shell in 1974 from 1998 he was Managing Director of Shell UK Exploration and Production, in 1999 he became Shell Country Chairman in the UK. In 2002 he became a managing director of Royal Dutch, and from 2004 was Managing Director of Shell Transport.