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: Com o tempo, a primeira se tornou ilustradora chefe da revista.
reference_flipped: Com o tempo, o primeiro se tornou ilustrador chefe da revista.