context: One of the most significant contributors of Garm was Tove Jansson who started her career in the magazine as a cartoonist in 1929 when she was just fifteen.
source: Over time the former became the magazine's chief illustrator.
reference_original: Mit der Zeit wurde sie zur leitenden Illustratorin der Zeitschrift.
reference_flipped: Mit der Zeit wurde er zum leitenden Illustrator der Zeitschrift.