Complex sentence: As the crown prince doesn't received much recognition from the Royal Courts of Kedah, he tried to sought assistance in Bangkok, although this proved to be vain since Ku Din was far more influential compared to the crown prince.
Split into simpler sentences: As the crown prince doesn't received much recognition from the Royal Courts of Kedah, he tried to sought assistance in Bangkok. His efforts proved to be vain since Ku Din was far more influential compared to the crown prince.