Complex sentence: Sickle-cell disease (SCD), also known as sickle-cell anaemia (SCA), is a genetically passed down blood disorder, caused by an abnormality in the oxygen-carrying protein haemoglobin found in red blood cells.
Split into simpler sentences: Sickle-cell disease (SCD), also known as sickle-cell anaemia (SCA), is a genetically passed down blood disorder. It is caused by an abnormality in the oxygen-carrying protein haemoglobin found in red blood cells.