Complex sentence: If a purchaser of car insurance policy is involved in an accident wherein the liability for the accident is undisputedly of their insured driver, then the insurance carrier has the duty to indemnify their insured driver in very specific ways to make them "whole" again.
Split into simpler sentences: If a purchaser of car insurance policy is involved in an accident; wherein, the liability for the accident is undisputedly of their insured driver. Then the insurance carrier has the duty to indemnify their insured driver in very specific ways to make them "whole" again.