If its already cracking there is nothing much you can do.
BTW, modern automotive leathers are plastic coated so no conditioning is necessary. Just keep it clean. The only way it would crack is if the plastic coating were compromised in some way ie; from excessive dirt buildup, abrasion, sun damage, etc. this plastic coating prevents any dressings or conditioners from contacting the actual leather so it just sort of sits on the surface that contributes to further, accelerated soiling.