Complex sentence: The "Gazetteer" was published in secret by the British government in India in 1908 and 1915 and it served as a handbook for British diplomats in the Arabian Peninsula and Persia.
Split into simpler sentences: The "Gazetteer" was published in secret by the British government in India in 1908 and 1915. It served as a handbook for British diplomats in the Arabian Peninsula and Persia.