It wasn't nutil I attended a diversity workshop that I realized the person we passed over was the perfect person.
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【解析】：
你的until 打错了。
It wasn't until I attended a diversity workshop that I realized the person we passed over was the perfect person.
直到我参加多样化补习班，我才意识到我们忽略掉的那个人才是完美的人。
这个句子里面含有一个强调句型，强调句型的特点就是去掉 It is/ was ...that ，句子还原回去依旧完整。
原句应该是：
I didn't realize the person we passed over was the perfect person until I attended a diversity workshop。
not .....until 直到...才....，为固定搭配。 pass over 置之不理，忽视；去世；迈过去
不懂请追问，(*^__^*) 嘻嘻~~
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追问理解这样的句子有什么方法，还有怎么还原？
追答这个怎么说呢？
比如： It is at that moment that he realized he was wrong.
这里强调的就是介词短语。
还原就是： He realized he was wrong at that moment.
关键就是找到句子的主语和主干。
原句中that的作用
追答回答如下：
原句中that 和It is +强调的内容+that 是个固定搭配，其连接前后句子的的作用，就像主语从句，同位语从句表语从句，那样，只起连接作用，希望你能明白，并采纳，谢谢！