Complex sentence: On 9 October he arrived in Amsterdam, the third capital of his empire and stayed a fortnight in the Royal Palace of Amsterdam, used by King Louis Bonaparte who had to leave Holland in 1810, forced by his brother.
Split into simpler sentences: On 9 October he arrived in Amsterdam, the third capital of his empire and stayed a fortnight in the Royal Palace of Amsterdam. The king had to leave Holland in 1810, forced by his brother.