Complex sentence: Later versions were a type of a wheelchair (as illustrated) which is pushed by an attendant, rather than pulled by an animal--in the 19th century they were often seen at spa resorts such as Buxton.
Split into simpler sentences: Later versions were a type of a wheelchair (as illustrated) which is pushed by an attendant rather than pulled by an animal. In the 19th century they were often seen at spa resorts such as Buxton.