Complex sentence: GDF agreed to sell its approximate 25% stake in Belgian electricity producer SPE to Électricité de France for €515 million; while Suez was forced to reduce its shareholding in natural gas distributor Fluxys and sell its Belgian gas supply subsidiary Distrigaz to Eni.
Split into simpler sentences: GDF agreed to sell its approximate 25% stake in Belgian electricity producer SPE for €515 million. Suez, meanwhile, was forced to reduce its shareholding in natural gas distributor Fluxys and sell its Belgian gas supply subsidiary Distrigaz to Eni.