Complex sentence: Nadezhda Chaikova was a correspondent for the Russian weekly "Obshchaya Gazeta" who was known for her exposés of Russian military atrocities and close contacts with the Chechen rebels.
Split into simpler sentences: Nadezhda Chaikova was a correspondent for the Russian weekly "Obshchaya Gazeta". She was known for her exposés of Russian military atrocities and close contacts with the Chechen rebels.