Complex sentence: Morrison revealed that she was diagnosed with lung cancer in recent years, but that she is now in remission, however her breast cancer, for which she was treated in 1988 and 1998 has returned.
Split into simpler sentences: Morrison revealed that she was diagnosed with lung cancer in recent years, but that she is now in remission. However her breast cancer, for which she was treated in 1988 and 1998, has returned.