英语翻译The idea of a computer goes back to the invention of the

英语翻译
The idea of a computer goes back to the invention of the abacus(算盘) in Asia Minor,more than 5000 years ago.More recently,there were developments in the past two centuries that are the foundation of what we call a computer today.
there were developments in the past two centuries that are the foundation of what we call a computer today.这句的结构是什么样子的?that如何理解?

there were developments in the past two centuries that are the foundation of what we call a computer today
翻译：在过去200年间的发展为今天我们称作的电脑奠定了基础.
1.其中that引导的是定语从句,充当的是先行词,代替developments
2.that引导的定语从句之中有又包含了一个由what引导的定语从句,修饰foundation
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