Complex sentence: He went as far as insisting to see the Governor at the Persian provincial capitol of Shiraz to formally protest his lost luggage and demand its return which, of course, was impossible since it held by the India Office in London.
Split into simpler sentences: He went as far as insisting to see the Governor at the Persian provincial capitol of Shiraz to formally protest his lost luggage and demand its return. This, of course, was impossible since it was held by the India Office in London.