Nissan and Renault announced Tuesday it would rebalance its perpetually shaky partnership—so-called the Alliance—into a more equitable partnership. Both automakers agreed to a 15% ownership stake in each automaker, with the remaining balance of what Renault owned in Nissan held in a trust until those shares can be sold. It’s a dramatic rebalancing of a tenuous partnership that’s been ongoing for more than two decades and has been a lightning rod for not only the respective automakers but also their respective cultures.