Original sentence: (Gambling on horses is prohibited at some tracks; the nationally renowened Colonial Cup Steeplechase in Camden, South Carolina, is known as one of the races which betting is illegal, because of a 1951 law in the state where betting on horse racing is illegal.) Where gambling is allowed, most tracks offer Parimutuel betting where gamblers' money is pooled and shared proportionally among the winners once a deduction is made from the pool.In most flat horse races, not including steeplechases, the pedigree of the horse is one of the things that allow it to race: the horse must have a sire (father) and a dam (mother) who are purebred individuals of whatever breed is racing.There are many dangers in horse racing for both horse and jockey: a horse can stumble and fall, or fall when jumping an obstacle, exposing both jockey and horse to the danger of being trampled and injured
Edited sentence: (Gambling on horses is prohibited at some tracks;  the nationally renowened Colonial Cup Steeplechase in Camden, South Carolina, is known as one of the races which betting is illegal, because of a 1951 law in the state where betting on horse racing is illegal.)  Where gambling is allowed, most tracks offer Parimutuel betting where gamblers' money is pooled and shared proportionally among the winners once a deduction is made from the pool.Horses can also fall when jumping a hedge, disabling them and causing an inability to run.In most horse races, not including steeplechases, the pedigree of the horse is one of the things that allow it to race: the horse must have a sire (father) and a dam (mother) who are purebred individuals of whatever breed is racing.There are many horrid dangers in horse racing for both horse and jockey: a horse can stumble and fall, exposing both jockey and horse to the danger of being trampled and possibly killed