Complex sentence: In 1996, he became senior partner of Freshfields and, following mergers in 2000, Co-Senior Partner of the resulting firm, Freshfields Bruckhaus Deringer, until 2006.
Split into simpler sentences: In 1996, he became senior partner of Freshfields. He was Co-Senior Partner of Freshfields Bruckhaus Deringer from 2000 until 2006.