Complex sentence: Cyanotic heart defect is a group-type of congenital heart defects (CHDs) that occurs due to deoxygenated blood bypassing the lungs and entering the systemic circulation or a mixture of oxygenated and unoxygenated blood entering the systemic circulation.
Split into simpler sentences: Cyanotic heart defect is a group-type of congenital heart defects (CHDs). Occurs due to deoxygenated blood bypassing the lungs and entering the systemic circulation, or a mixture of oxygenated and unoxygenated blood entering the systemic circulation.