Complex sentence: The demise of the monarch resulted the crowning of Ahmad Tajuddin Halim Syah as the new Sultan, the appointment was endorsed and recognised by the Siamese, who perceived Kedah as their vassal state.
Split into simpler sentences: The demise of the monarch resulted the crowning of Ahmad Tajuddin Halim Syah as the new Sultan. The election was endorsed and recognised by the Siamese, who perceived Kedah as their vassal state.