Complex sentence: Ib Spang Olsen (June 11,1921--January 15,2012) was a Danish writer and illustrator best known to generations of Danes for cartoons and illustrations, many of which appeared in children's publications.
Split into simpler sentences: Ib Spang Olsen (June 11,1921--January 15,2012) was a Danish writer and illustrator. Olsen was best known to generations of Danes for his cartoons and illustrations, many of with appeared in children's publications.