Complex sentence: Cumbum Lake, also known as "Gundlakamma Lake", was built on the Gundlakamma rivulet upon Nallamalai hills and is one of the oldest man-made lakes in Asia.
Split into simpler sentences: Cumbum Lake, also known as "Gundlakamma Lake", was built on the Gundlakamma rivulet upon Nallamalai hills. It is one of the oldest man-made lakes in Asia.