Complex sentence: After graduation and receiving her MA degree in Arts, Natalia went to the "Lenfilm" film studio and won the competition contest for the Costume Design position, where she worked until her immigration to the United States.
Split into simpler sentences: After graduation and receiving her MA degree in Arts, Natalia went to the "Lenfilm" film studio and won the competition contest for the Costume Design position. There she worked until her immigration to the United States.