Complex sentence: Korsak worked as an editor of the newspaper Radyans’ke Polissya "in Kamin"-Kashirskiy (1975--1990), "Narodna trybuna" in Lutsk (1990--1995), and since 1996-chief editor of the newspaper "Simya i Dim".
Split into simpler sentences: Korsak worked as an editor of the newspaper Radyans’ke Polissya "in Kamin"-Kashirskiy (1975--1990), "Narodna trybuna" in Lutsk (1990--1995). In 1996, he became the chief editor of the newspaper "Simya i Dim".