In the village Ecône in Switzerland was a feast. The Pius Brothers named 4 new bishops there. Pope Leo the 14th did not allow this. The Pius Brothers are a strict group of priests. They do not like many new church rules.
This act happens without permission from the Pope. Church law says this is wrong. People who do this are excommunicated. This means they must leave the church group. The new bishops and the priests must leave. The Pius Brothers say the law does not apply.
The trouble lasts for a long time. In the year 1988 this happened too. Then the church also forced a split. Experts call this a Schisma. That means the church group is now broken.