Complex sentence: Athletics had the largest team by sport with only 13 competitors, roughly a third of the nation's full roster size; apart from triathlon and weightlifting, there was also a single competitor each in archery, judo, and shooting.
Split into simpler sentences: Athletics had the largest team by sport with only 13 competitors, roughly a third of the nation's full roster size. Apart from triathlon and weightlifting, there was also a single competitor each in archery, judo, and shooting.