Complex sentence: Vientiane was the host of the incident-free 2009 Southeast Asian Games, with 18 competitions being dropped from the previous games held in Thailand, due to Laos' landlocked state and the lack of adequate facilities in Vientiane.
Split into simpler sentences: Vientiane was the host of the incident-free 2009 Southeast Asian Games. Eighteen competitions were dropped from the previous games held in Thailand, due to Laos' landlocked borders and the lack of adequate facilities in Vientiane.