original: A saddle is a supportive structure for a rider or other load, fastened to an animal's back by a girth.
simplifications: A saddle is fastened to an animal to support  a rider or other load. A saddle is a structure for a rider or load tied to an animal's back. A saddle is a supportive structure for a rider or other load. It is secured to an animal's back. A saddle is a supportive structure for a rider or other load. It is fastened to an animal's back by a girth. A saddle is a supportive structure for a rider or other load. It is attached to an animal's back by a girth. A saddle is attached to an animal's back and supports a load such as a rider. A saddle is a structure that supports a rider or other load on an animals back. A saddle is a supportive structure for a rider or other load which is fastened to an animal's back by a girth. A saddle is a rider or other load hold up form, fastened by a body size to the back of an animal. A saddle is a structure that supports a rider or other load, locked to an animal's back by a girth.