Two or more satellites slamming into each other could create many more out-of-control bits that would pose even more hazards to the growing collection of satellites in space.
句中出现that从属连词需要划从句,从that开始到句末结束,that在从句中做成份为定语从句,由于其长度够长,所以顺着理解即可;
to the growing collection of satellites in space,to介词短语,前面有动词有名词,优先考虑修饰动词pose,后出现A of B结构,应为B的A,in space介词短语修饰前面的satellites;
本句主句谓语动词为could create,从前找其主语为Two or more satellites,这样主谓之间还有个slamming into each other动词ing形式的短语做定语修饰主语;
两个(以上)相互撞击的卫星可以产生许多无法控制的碎片,它们会对(太空中增长的卫星)造成更大的危害。