Complex sentence: The "Snork Maiden" was a fictional character (a companion of Moomintroll), in the writings and illustrations of Tove Jansson, appearing in Moomin books of the 1950s, 1960s, and 1970s.
Split into simpler sentences: The "Snork Maiden" was a fictional character (a companion of Moomintroll), in the writings and illustrations of Tove Jansson. The Snork Maiden appeared in Moomin books of the 1950s, 1960s, and 1970s.