Complex sentence: She could fire explosive arrows and when majorly attacked she'd shatter into ice cubes and reform okay at least until the giant Iceburge containing the frozen souls of 111 people was destroyed.
Split into simpler sentences: She could fire explosive arrows and, when majorly attacked, she'd shatter into ice cubes and reform. This ability, however, only worked until the giant iceberg containing the frozen souls of 111 people was destroyed.