Elaborate efforts were made to reconstruct what had happened.是什么意思？

Elaborate efforts were made to reconstruct what had happened.

为重现当时的情景，他们做了大量细致的工作。

elaborate

vi. 详尽说明，变得复杂；vt. 详细制定，详尽阐述，[生理学]加工，尽心竭力地做；

例句
His new play, Arcadia, is as intricate, elaborate and allusive as anything he has yet written.
他的新剧《阿卡迪亚》和他写过的任何作品一样，错综复杂、构思精巧并且富含典故。

efforts

n. 努力( effort的名词复数 )，气力，努力的结果，努力（或艰难尝试）的成果；

例句
They talked modestly of their valiant efforts to keep the tanker afloat...
他们说起自己设法使油轮漂浮的英勇之举时非常谦虚。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

made

adj. …制的，（人工）做成的，拼成的，虚构的，保证成功的；v. 使(make的过去式和过去分词)；

例句
Single people are treated as an aberration and made to pay a supplement.
独身者被当成异类，而且要付一笔额外的费用。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

reconstruct

vt. 重建，重现，改造，复兴；

例句
The government must reconstruct the shattered economy...
政府必须重建支离破碎的经济。

what

pron. （用以询问某人或某事物的词）什么，多少，…的事物；adj. …的（事物或人）；adv. （用于感叹句中）；int. （用以表示不相信或惊奇），（用以表示未听清楚对方说的话）；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

happened

v. 发生（ happen的过去式和过去分词 ），出现，碰巧；

例句
He gave a detailed account of what happened on the fateful night...
他详细描述了那个灾难性夜晚所发生的事。