Complex sentence: In 2004, he became president and director of Exxon Mobil and on January 1,2006, he was elected chairman and chief executive officer (CEO), following the retirement of Lee Raymond.
Split into simpler sentences: In 2004, he became president and director of Exxon Mobil. On January 1,2006, Tillerson was elected chairman and chief executive officer (CEO), following the retirement of Lee Raymond.