Look up local furniture stores and professionals near you, and contact them about the damaged item. You should be able to get a free estimate from several stores and professionals, and compare estimates to find the proper combination of cost and effectiveness.
Match the color of the new leather with the damaged furniture before you replace the cracked areas. Putting in a new section that does not match will be unsightly and a waste of money.
Care for the leather properly once it is replaced. Taking good care of leather furnishings will avoid future cracking and other forms of irreversible leather damage. Guidelines for taking care of leather furniture can be found both online and by contacting a local furniture store.