Complex sentence: In 2006 when Peter was 9 years old, he finished creating animations, which included the collection "Wonderland" (10.04.2006) some of his first animations are "Marina" and "Shkafcho".
Split into simpler sentences: In 2006 when Peter was 9 years old, he finished creating animations, which included the collection "Wonderland" (10.04.2006). Some of his first animations are "Marina" and "Shkafcho".