Simplify the following text for a Grade 9 native English-speaking person.
Original: The nearby royal houses of Reuss and Schwarzburg also divided up their territory , so Thuringia was a tangle of little states , exclaves and enclaves from the late 15th Century until the early 20th Century .
Simplified: Similar events in the houses of Reuss and Schwarzburg led to all of Thuringia becoming a tangle of mini-states from the late 15th Century until the early 20th Century .