Complex sentence: The problem has become so severe it has caused a rise in Russian nationalism, and spawned groups like Movement Against Illegal Immigration, was banned by the Moscow City Court in 2011 on the grounds that it "ignites inter-ethnic hatred".
Split into simpler sentences: The problem has become so severe it has caused a rise in Russian nationalism, and spawned groups like Movement Against Illegal Immigration. In 2011, the group was banned by the Moscow City Court on the grounds that it "ignites inter-ethnic hatred".