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?