Complex sentence: A Smith's fracture, also sometimes known as a reverse Colles' fracture is a fracture of the distal radius caused by falling onto flexed wrists, as opposed to a Colles' fracture which occurs as a result of falling onto wrists in extension.
Split into simpler sentences: A Smith's fracture, also sometimes known as a reverse Colles' fracture is a fracture of the distal radius. It is caused by a direct blow to the dorsal forearm or falling onto flexed wrists, as opposed to a Colles' fracture which occurs as a result of falling onto wrists in extension.