It tends to ignore, and thus eventually to eliminate, many elements in the land community that lack commercial value, but that are essential to its healthy functioning.
【重点词汇】ignore 忽视，忽略 eventually最终地 community社区，群落 commercial 商业的 functioning运行，运作
【结构分析】句子主干：It tends to ignore, and thus eventually to eliminate, many elements.
修饰成分：in the land community为介词短语作后置定语修饰名词elements，翻译“陆地群落的许多元素”，that lack commercial value, but that are essential to its healthy functioning为that引导的定语从句修饰名词“elements”，由于定语从句较长，采取后置法。
【参考译文】它往往忽视并且最终消灭陆地群落中的许多元素，虽然他们缺乏商业价值，但是对健康的运行是至关重要的。
