Complex sentence: Lorena, the more focused group, is a cute with a good heart, back to school her boyfriend of a lifetime, Mariano, the ends because confesses that he loved her supposed best friend Tania.
Split into simpler sentences: Lorena, the more focused of the group, is a cute girl with a good heart. When she returns to school, Lorena's longtime boyfriend, Mariano, leaves her after he confesses that he loves her supposed best friend Tania.