Simplify the following text for a Grade 8 native English-speaking person.
Original: It became the only temporary capital city in Europe during the Interwar period . Now it is the capital of Kaunas County , the seat of the Kaunas city municipality and the Kaunas district municipality .
Simplified: Kaunas , also known by several other names , is the second biggest city in Lithuania and used to be a temporary capital .