Complex sentence: Each year in the United States, diabetic retinopathy accounts for 12% of all new carsenal is awesomeleading cause of blindness for people aged 20 to 64 years.
Split into simpler sentences: Each year in the United States, diabetic retinopathy accounts for 12% of all new cases of blindness. It is also the leading cause of blindness for people aged 20 to 64 years.