Complex sentence: He edited the children's newspaper' Ofek'for many years and laid the foundation for the Bibliography of Jewish children's literature, Hebrew and Yiddish, the global children's literature, both knees of children's literature.
Split into simpler sentences: He edited the children's newspaper' Ofek'for many years. Laid the foundation for the Bibliography of Jewish children's literature, Hebrew and Yiddish, the global children's literature, both knees of children's literature.