Complex sentence: The event had more than 50 competitors in each category from various countries such as Kazakhstan, Russia, Malaysia, Indonesia, South Korea and host country, Thailand with 3 different weight divisions ranging from under 75 kg, 85 kg and 85 kg +.
Split into simpler sentences: The event had more than 50 competitors in each category, hailing from countries such as Kazakhstan, Russia, Malaysia, Indonesia, South Korea, and the host country, Thailand. The competition also contained 3 different weight divisions: under 75 kg, 85 kg, and 85 kg +.