Complex sentence: Kenneth Lonergan won Best Original Screenplay and Casey Affleck won Best Actor in a Leading Role for "Manchester by the Sea", while Luke Davies won Best Adapted Screenplay and Dev Patel won Best Actor in a Supporting Role for "Lion".
Split into simpler sentences: Kenneth Lonergan won Best Original Screenplay and Casey Affleck won Best Actor in a Leading Role for "Manchester by the Sea". While Luke Davies won Best Adapted Screenplay and Dev Patel won Best Actor in a Supporting Role for "Lion".