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Agencies and companies throughout the world are working on developing technology that would dispose of or capture space debris before it causes serious damage.

本句谓语动词为are working on developing，主语从前往后找为：agencies and companies，宾语为technology;

主谓之间throughout the world做定语修饰主语，宾语后有that从句，到句末结束，that从句内部嵌套了一个before时间状语从句修饰修饰that从句，理解时，需放到that从句前或that从句谓语动词前;

(全世界的)机构和公司正在开发一种科技能够(在它导致严重损害之前)解决或者捕捉到太空碎片。