Complex sentence: For this reason, the first chapter of her book primarily focuses on what she thinks the definition of love is, which she explains includes components such as care, affection, trust, respect, honesty, communication, and commitment.
Split into simpler sentences: For this reason, the first chapter of her book primarily focuses on what she thinks the definition of love is, in which she explains contain a number of components. Some components include: care, affection, trust, respect, honesty, communication, and commitment.