Complex sentence: She lived happily and serenly with her family in Dragon's Rest, a beautiful Keep on the edge of Princemarch and the Desert, though she was terrified of the dragons, whom also made the valley their home or whom soared overhead.
Split into simpler sentences: She lived happily and serenly with her family in Dragon's Rest, a beautiful Keep on the edge of Princemarch and the Desert. Though she was terrified of the dragons, whom also made the valley their home or whom soared overhead.