Complex sentence: Besides the embassy, a U.S. consulate-general is located on Curaçao which is responsible for the territory of the Kingdom of the Netherlands in the Caribbean, but which is not part of the U.S. diplomatic mission to the Netherlands.
Split into simpler sentences: Besides the embassy, a U.S. consulate-general is located on Curaçao which is responsible for the territory of the Kingdom of the Netherlands in the Caribbean. This consulate is not part of the U.S. diplomatic mission to the Netherlands.