Complex sentence: Clare was murdered by Dr. Paul Browning (Joseph Thompson) and she arrives in search of justice for Clare, but Grace is unaware that he has been murdered by Mercedes McQueen (Jennifer Metcalfe).
Split into simpler sentences: Clare was murdered by Doctor Browning (Joseph Thompson) and she arrives in search of justice for Clare. But Grace is unaware that he has been murdered by Mercedes McQueen (Jennifer Metcalfe).