Complex sentence: Coraline meets Wyborn "Wybie" Lovat, the grandson of the apartments' landlady, Mrs. Lovat, who claims to have a missing twin sister and a black cat, also known as the Cat, that follows Wybie around.
Split into simpler sentences: Coraline meets Wyborn "Wybie" Lovat, the grandson of the apartments' landlady, Mrs. Lovat, who claims to have a missing twin sister. She also meets a mysterious black cat, also known as the Cat, that often follows Wybie around.