Complex sentence: In 2006, Vallejo entered the University of Chile to study geography, where she started forming ties with leftist students and getting involved in politics, which led her to join the Chilean Communist Youth the next year.
Split into simpler sentences: In 2006, Vallejo entered the University of Chile to study geography. There, she started forming ties with leftist students and getting involved in politics, which led her to join the Chilean Communist Youth the next year.