In any event,whether or not the reason is the energy expense,it seems to be the case that,with the possible exception of some weird deep-sea fish,no animal apart from man uses manufactured light to find its way about.
In any event状语,whether or not the reason is the energy expense条件状语从句,it seems to be the case 主句that(that引导同位语从句,表明都是这种情况),with the possible exception of some weird deep-sea fish(状语:除了一些奇怪的深海鱼类),no animal apart from man uses manufactured light to find its way about (除了人类之外,没有其他动物使用制造出的(对于人是人造,动物要翻译成 ???)灯光来找路。)