Complex sentence: At the age of 18, in the town of St. John, Missouri, Lannert shot her father while he slept, citing ongoing abuse of her younger sister, Christy, as a catalyst.
Split into simpler sentences: At the age of 18, in the town of St. John, Missouri, Lannert shot her father while he slept. Later, after confessing to killing her father, she cited the ongoing abuse of her younger sister, Christy, as a catalyst.