Complex sentence: The first issue of "L’Écho des Savanes" was published on May 1,1972, and was the only issue that year, although popular demand caused it to be reprinted in several editions.
Split into simpler sentences: The first issue of "L’Écho des Savanes" was published on May 1,1972. It was the only issue that year, although popular demand caused it to be reprinted in several editions.