Complex sentence: Wallin was appointed as Minister of the Environment by President Tarja Halonen on December 29,2006, in succession to Jan-Erik Enestam, who was also Wallin's predecessor as chairman of the Swedish People's Party.
Split into simpler sentences: Wallin was appointed as Minister of the Environment by President Tarja Halonen on December 29,2006. He succeeded Jan-Erik Enestam, who was also Wallin's predecessor as chairman of the Swedish People's Party.