Complex sentence: Notably, Brunei did not participate in the non-optional sports event section held in Kuala Lumpur, rather it participated only in the state held Sukma Games held in the even years as usual.
Split into simpler sentences: Notably, Brunei did not participate in the non-optional sports event section held in Kuala Lumpur. Rather it participated only in the state held Sukma Games held in the even years as usual.