Complex sentence: He became a Director of Shell Transport and Trading in 2002, and chaired the group of Directors who brought about the creation in 2005 of Royal Dutch Shell plc, of which he was Deputy Chairman and Senior Independent Director until 2012.
Split into simpler sentences: He became a Director of Shell Transport and Trading in 2002. Additionally, he chaired the group of Directors who brought about the creation in 2005 of Royal Dutch Shell plc, of which he was Deputy Chairman and Senior Independent Director until 2012.