Complex sentence: Mongeau quotes Theiss and Solomon, who have done many scholarly articles on dating, stating that first dates are very important because partners are both getting to know each other and attempting to establish a relationship definition as well.
Split into simpler sentences: Mongeau quotes Theiss and Solomon, who have done many scholarly articles on dating. He states that first dates are very important because partners are both getting to know each other and attempting to establish a relationship definition as well.