Complex sentence: Although hard to anger, Presea will kill when angry, shown when she goes after Vharley and attacks Regal in Welgaia (Colette is attacked if Regal is taken hostage).
Split into simpler sentences: Although hard to anger, Presea will kill when angry. This is shown when she goes after Vharley and attacks Regal in Welgaia (Colette is attacked if Regal is taken hostage).