Okay kiddo, let me explain what is a split estate. Imagine you have a huge piece of land that has a house, a playground, a swimming pool, and a garden on it, but there is oil underneath the ground. Split estate means that the person who owns the surface (the house, playground, swimming pool, and garden) is not the same person who owns the oil underneath.
It's like your toy box, where your mom owns the outside of the box and you own the toys inside. So, if someone wants to take the oil from under your playground, they might have to go talk to the person who owns the oil, not you or your mom. This can cause some problems because the person who owns the oil might want to come onto your property to do some drilling or digging, which might damage your playground or your garden.
In the real world, split estate can happen when land is divided into two or more ownership rights, such as mineral rights or surface rights. This arrangement can cause some conflicts and issues between the two parties, and they have to negotiate the use of the land, which can be a bit confusing and complicated.
So, split estate means that one person owns the surface of the land, and another person owns what's underneath it, which can sometimes create some difficulties between them.