Complex sentence: During the hundreds of years of its history it changed ownership many times, but the first mention of the castle is in the beginning of 14th century when the castle was bought by Rudolf von Erlach, the victor of the Battle of Laupen.
Split into simpler sentences: During the hundreds of years of its history it changed ownership many times. In the beginning of 14th century the castle was bought by Rudolf von Erlach, the victor of the Battle of Laupen.