Complex sentence: The festival started in summer, 2011, sparked by Aurella Brzezowska, a seven-year-old girl, not having any books at her house, instead, she was taught to read by a reading volunteer.
Split into simpler sentences: The festival started in summer 2011, sparked by Aurella Brzezowska, a seven-year-old girl who had no books at her house. Instead, she was taught to read by a reading volunteer.