Furthermore, the use of the computer system caused long waiting times because everyone wanted - understandably - to find out more about suitable working opportunities.

understandably 是由形容词 understandable（可以理解的）加上副词后缀 -ly 构成的副词，意思是"可以理解地、合乎情理地"。在句中修饰整个分句，表示"想要了解更多工作机会"这个行为是合情合理的。