What are respirasomes?
What the article is saying, is that there are several respirasomes, each of which consists of multiple other mitochondrial complexes or cytochromes. The article makes an example of three commonly observed respirasomes when it says:


  The most common supercomplexes observed are Complex I/III, Complex
  I/III/IV, and Complex III/IV.


So, the short answer to your question is that a respirasome refers to a set of multiple cytochromes, whose combined action leads to respiration. 

This paper goes into more detail, and reiterates that the term "respirasome" is used to describe multiple cytochrome supercomplexes.