Complex sentence: In 1942 she won the Mallarmé prize to honour her work and bring out her book "Tenter de vivre" and first met Jean Cocteau, with whom she became well acquainted.
Split into simpler sentences: In 1942 she won the Mallarmé prize to honour her work and bring out her book "Tenter de vivre". At that time she also met Jean Cocteau with whom she became well acquainted.