Complex sentence: In November 1940 Reich and his parents found themselves in the Warsaw Ghetto, during which time he worked for the Judenrat as a chief translator, and contributed to the collaborative newspaper "Gazeta Żydowska" ("The Jewish Newspaper") as a music critic.
Split into simpler sentences: In November 1940 Reich and his parents found themselves in the Warsaw Ghetto. During his stay there he worked for the Judenrat as a chief translator, and contributed to the collaborative newspaper "Gazeta Żydowska" ("The Jewish Newspaper") as a music critic.