Complex sentence: Hyperkalemic periodic paralysis (HYPP, HyperKPP), also known as Impressive Syndrome in horses, is an inherited autosomal dominant disorder which affects sodium channels in muscle cells and the ability to regulate potassium levels in the blood.
Split into simpler sentences: Hyperkalemic periodic paralysis (HYPP, HyperKPP) is a genetic disorder which occurs in both humans and horses, where it is also known as Impressive Syndrome. It is an inherited autosomal dominant disorder which affects sodium channels in muscle cells and the ability to regulate potassium levels in the blood.