Complex sentence: A new distribution of tasks among public agencies led to the French Solar Energy Authority being discontinued: its tasks were taken over, and expanded, by ADEME which, compared with its predecessors, has a wider purvue which includes the environment.
Split into simpler sentences: A new distribution of tasks among French public agencies led to the Solar Energy Authority being disbanded. Its tasks were taken over and expanded by the Agence de l'Environnement et de la Maîtrise de l'Energie (ADEME; Agency for the Environment and Energy Management) which, compared with its predecessors, has a wider purvue, including the environment.