Complex sentence: In 1980, Alfredson sold his first painting "UFO Sverige Aktuellt" to a Swedish magazine; it subsequently was shown at an exhibition of UFO artwork in the Köpings Museum; the commissioned work depicted a UFO in the sky with two aliens standing below.
Split into simpler sentences: In 1980, Alfredson sold his first painting "UFO Sverige Aktuellt" to a Swedish magazine; it subsequently was shown at an exhibition of UFO artwork in the Köpings Museum. The commissioned work depicted a UFO in the sky with two aliens standing below.