Complex sentence: In 1965 a cascade 40.5 m high was built in order to form an artificial lake--the Batlava Lake, which can handle up to 40 million m³ of water and was primary built for ECK needs, to be used later for consuming purposes.
Split into simpler sentences: In 1965 a cascade 40.5 m high was built in order to form an artificial lake. This accumulation can handle up to 40 million m³ of water and was primary built for ECK needs, to be used later for consuming purposes.