Complex sentence: During the 1990s he worked on cases involving the occupation of the Brent Spar oil platform and provided advice to the "McLibel two", activists who were being sued by McDonald's.
Split into simpler sentences: During the 1990s Stephens worked on cases arising from the occupation of the Brent Spar oil platform. He also provided advice to the "McLibel two", activists who were being sued by McDonald's.