Complex sentence: She is from the Russian Federation, which at the time of the series'creation was part of the Soviet Union this is generalized in the introduction as "Eastern Europe" after the Soviet Union's collapse in 1991.
Split into simpler sentences: She is from the Russian Federation, which at the time of the series'creation was part of the Soviet Union. This is generalized in the introduction as "Eastern Europe" after the Soviet Union's collapse in 1991.