Officials at the White House announced a new space policy focused on managing the increasing number of satellites that companies and governments are launching into space.

at the White House介词短语位于officials名词后作定语修饰officials，focused on…satellites为动词ed形式的短语做后置定语修饰policy，以及最后that从句为定语从句修饰satellites;

本句话主干的谓语动词为announced，主语officials以及宾语a new space policy，其余为修饰成分;

从focused on短语以及that从句相互具有修饰关系，所以理解时应当作一个整体，这样句子较长，可直接顺着理解。

(白宫的)官员们宣布了一项新的太空政策，它专注于管理政府发射到太空站的大量的卫星。