Complex sentence: Instead, list articles in both "Foo of X" and "Foo of Y"; for example, "Foo of Russia" and "Foo of the Soviet Union", not "Foo of Russia and the Soviet Union".
Split into simpler sentences: Instead, list articles in both "Foo of X" and "Foo of Y". For example, "Foo of Russia" and "Foo of the Soviet Union", not "Foo of Russia and the Soviet Union".