original: This disease is often mild and attacks often pass unnoticed.
simplifications: This disease is often mild and attacks are sometimes unnoticed. This disease is mild and attacks often go unnoticed. The disease is mild. It often passes unnoticed. This disease is often mild. Attacks often go unnoticed. This disease is often mild. Attacks often pass unnoticed. This disease is usually not serious and attacks can happen without anyone noticing. The disease is usually mild and effects is usually unnoticed. THis disease is many a times mild. so its attacks are unnoticed a lot of times. This disease is often subtle and attacks often go unnoticed. This disease is usually not serious.