Original: Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, two-chambered hearts, and skeletons made of cartilage rather than bone.
Simplified: Chondrichthyes or cartilaginous fishes are jawed fis with paired fins, paires nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone.