Complex sentence: Santana serenades Brittany with Taylor Swift's "Mine" and confides with Brittany that their relationship isn't working, and proposes that they have an open relationship, stating they're not really breaking up, though this leaves Brittany devastated.
Split into simpler sentences: Santana serenades Brittany with Taylor Swift's "Mine" and confides with Brittany that their relationship isn't working. She proposes that they have an open relationship, stating they're not really breaking up, which leaves Brittany devastated.