一个史上巨难的英语句子的结构分析及翻译------------务必高手帮忙

Question

【Whales that suffer the bends often do so because they have surfaced to escape a predator（捕食动物）such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches.】Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey（猎物）as well as predator—and often had to make a speedy exit as a result.
请分析【】里的2个句子结构，我觉得很乱，详细点，然后标准翻译一下，拜托了。

Answer 1

第1句：
主语：whales （带有定语从句，其中that是从句的主语，suffer是谓语动词，the bends是宾语）
谓语：do so
原因状语从句：because they have...a large shark
（其中because是从属连词，they是从句的主语，谓语是have surfaced，目的状语是to escape a predator such as ... shark）

第2句：
主语：One of the features of Jurassic oceans
谓语动词：was
表语：an abundance of large sharks and crocodiles
非限制性定语从句：both of which were fond of ...lunches （补充说明 sharks and crocodiles）

句子可以翻译为：
患有“弯曲症”的鲸鱼往往会这样做（指通过进化长出能抗减压的器官），因为它们曾经浮出水面，目的是为了逃避捕食者，如大鲨鱼。侏罗纪时期的海洋具有的特征之一是大量的大鲨鱼和鳄鱼；这两种动物都喜欢拿鱼龙当美餐。

注：
依据上文，often do so 是指 evolve an anti-decompression means，即：通过进化长出能抗减压的器官。

Answer 2

Whales( that suffer the bends定语从句) often do so (状语从句because they have surfaced to escape a predator（捕食动物）such as a large shark). One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, (both of which were fond of ichthyosaur 状语从句)lunches.】

鲸鱼饱受弯道的困挠而时常那么做,因为他们可以浮出水面,逃离食肉动物的追捕,如鲨鱼.侏罗纪海洋有个特点, 有大量鲨鱼和鳄鱼存在,且它们都喜欢猎食鱼龙.

Answer 3

不难吧？
第一句主语Whales, 主从that suffer the bends， 谓语do so, because后就是状语从句，表原因（曾经浮上水面躲避诸如大型鲨鱼等猎食者）
第二句更简单，both of which就是指large sharks and crodcodiles.
我想不出难在哪里，所以不翻了