Complex sentence: The drug seems ineffective in the maintenance of rapid-cycling bipolar disorder; however, according to studies in 2007, lamotrigine may treat bipolar depression without triggering mania, hypomania, mixed states, or rapid-cycling.
Split into simpler sentences: The drug seems ineffective in the maintenance of rapid cycling bipolar disorder. According to studies in 2007, Lamotrigine may treat bipolar depression without triggering mania, hypomania, mixed states, or rapid-cycling.